Selected journal articles, reviews and clinical guidelines behind our health guides. A useful finding comes with the people studied, the limits, and an explanation you can actually use.
Editorial summaries · Direct source links · Access clearly labeled
Read with a little context
What kind of answer?
Study design helps you understand the question a paper can address. It does not tell the whole quality story.
Our selection is editorial and focused on the linked guides. It is not a systematic review of every topic, a formal evidence grade, or a clinical review of Millywell.
Clinical guidelines & position statements
Recommendations combine research with judgments about benefits, harms and care. Check the population, country, publication date, and whether an update changes the advice.
Systematic reviews & meta-analyses
These examine a defined body of studies. Conclusions still depend on which studies were available, how they were selected, their quality, and whether the results fit together.
Randomized trials
Random assignment can help compare interventions. Sample size, duration, comparison group and the exact treatment or product still matter. A finding for a blend cannot identify the effect of one ingredient.
Observational studies
These look for patterns in people’s lives. An association can be informative while leaving other explanations possible; it does not by itself establish cause and effect.
Buysse DJ, Arnedt JT, Buenaver L, et al. · Journal of Clinical Sleep Medicine
What it found: The AASM conditionally favors starting CBT-I with medication over medication alone, but conditionally favors CBT-I alone over routinely starting both together. The comparison matters: this is not a recommendation that everyone with insomnia needs a prescription. Patient priorities can change the choice, which belongs in a clinical conversation.
Who was studied, limitations & context +
Population or scope
Adults with chronic insomnia disorder considering CBT-I, insomnia medication, or starting both together.
What to keep in mind
Both recommendations rely on low-certainty evidence. The guideline mainly evaluates starting treatments concurrently; it does not settle every sequence of adding or changing treatment. Do not start, stop or combine medicines using this summary.
Why it is included
Adds current context to a discussion of insomnia options and questions about treatment access. It does not assess whether a particular medicine is suitable for a reader.
Ryan Tam, Lachlan Mitchell and Adrienne Forsyth · Nutrients
What it found: Some studies found performance benefits, but most comparisons did not show an advantage over placebo. The review found that women-specific evidence was smaller and more varied than broad creatine marketing suggests. It supports a measured discussion of an optional training supplement, rather than a promise that every active woman will improve.
Who was studied, limitations & context +
Population or scope
Physically active female participants, from recreational to elite, across 27 studies.
What to keep in mind
Studies used different participants, tests, doses and durations. Female physiology and menstrual-cycle considerations were often poorly addressed. These short studies do not establish a personalized strategy or prove benefits for fatigue, menopause symptoms or long-term health.
Why it is included
This adds women-specific context to the creatine guide and helps separate the broader sports evidence from claims aimed specifically at women.
Seung-Kwon Myung and Yunseo Park · The American Journal of Medicine
What it found: Pooling all trials suggested improvements in skin measurements. However, the apparent benefits were not found in analyses restricted to higher-quality studies or studies without pharmaceutical-company funding. This makes the overall story less persuasive than a headline based only on the combined positive result.
Who was studied, limitations & context +
Population or scope
Adults enrolled in 23 randomized trials of oral collagen products.
What to keep in mind
Products, study methods and measured outcomes differed. Funding and quality analyses raise concerns about bias, while subgroup findings also have limits. Skin measurements do not establish that a product treats joint pain or other health conditions.
Why it is included
This explains why the collagen guide treats benefits as uncertain and why supplement research needs to be read beyond the most favorable headline.
Mary Ann Lumsden, Olaf M. Dekkers, Stephanie S. Faubion and colleagues · European Journal of Endocrinology
What it found: This guideline recommends looking at the whole person, including symptoms, medical history, preferences and access to care. Hormone therapy choices require discussion of benefits, risks and alternatives, with review after treatment starts. It also separates treating menopausal symptoms from using hormones primarily to prevent cardiovascular disease or dementia.
Who was studied, limitations & context +
Population or scope
Women experiencing perimenopause, menopause, early menopause or premature ovarian insufficiency.
What to keep in mind
The strength of evidence differs between recommendations, and some rely on clinical consensus. It is European guidance, so available products and care arrangements may differ. It cannot determine whether hormone therapy is appropriate for an individual reader.
Why it is included
Supports our emphasis on symptom priorities, age-sensitive assessment and individual treatment decisions. Vaginal symptoms and hot flushes can lead to different care conversations rather than one general hormone plan.
What it found: After reviewing screening evidence and modeling, the task force recommended mammograms every other year from ages 40 through 74 for the population covered by its statement. The recommendation weighs potential benefits against false-positive results, additional procedures and overdiagnosis; it is a plan for screening people without relevant symptoms.
Who was studied, limitations & context +
Population or scope
People assigned female at birth aged 40 and older at average breast-cancer risk; the recommendation has specific exclusions.
What to keep in mind
This is not a schedule for everyone with a breast concern or a high-risk history. Evidence was insufficient for some questions, including additional ultrasound or MRI after a negative mammogram in dense breasts and screening from age 75.
Why it is included
It supports the article’s starting point for routine mammography while explaining why symptoms, previous findings and individual history still need a separate conversation.
Cecilie Jespersen, Mette Petri Lauritsen, Vibe G. Frokjaer and Jeppe B. Schroll · Cochrane Database of Systematic Reviews
What it found: The review found that SSRIs probably reduce self-rated premenstrual symptoms compared with placebo, while also increasing unwanted effects such as nausea and fatigue. It examined both continuous and cycle-related administration. These findings support a treatment discussion after appropriate assessment, rather than treating every difficult week before a period as the same condition.
Who was studied, limitations & context +
Population or scope
Randomized trials in women with prospectively diagnosed PMS or PMDD.
What to keep in mind
Reporting weaknesses and possible publication bias limit confidence; many included trials had pharmaceutical funding. Benefits and adverse effects need to be weighed together. The review does not diagnose PMDD or tell a reader to start, stop or change medication.
Why it is included
Shows that help can extend beyond tracking symptoms. Our PMS and PMDD guide uses tracking to clarify the pattern and impact, then brings treatment choices to a qualified professional.
Marie B. Demay, Anastassios G. Pittas and colleagues · The Journal of Clinical Endocrinology & Metabolism
What it found: For generally healthy, nonpregnant adults aged 19–74 without separate indications, the panel advises against routine vitamin D testing and routine intake above established dietary reference amounts. Pregnancy and certain other groups have separate recommendations. Everyday nutrition, measuring a blood level and treating an established problem are different decisions.
Who was studied, limitations & context +
Population or scope
Disease-prevention guidance for people without established indications for vitamin D testing or treatment; recommendations differ by age, pregnancy and other circumstances.
What to keep in mind
This is prevention guidance, not a universal deficiency-treatment protocol. Several recommendations are conditional, and evidence does not establish one blood-level target for every health outcome. Individual indications and circumstances can change the appropriate plan.
Why it is included
This gives scientific context for asking what a vitamin D test would change and avoiding the assumption that everyone needs extra-high intake or routine testing.
Wang F, Gao Y, Han Z, et al. · Nature Human Behaviour
What it found: The review found that loneliness and social isolation were associated with higher mortality in the studied populations. Loneliness and isolation are related but different experiences. The findings make social connection a worthwhile health topic, without turning a reader’s current social situation into a prediction about how long they will live.
Who was studied, limitations & context +
Population or scope
90 prospective cohort studies involving more than two million adults; populations and measures of connection varied.
What to keep in mind
These were observational studies, so the associations do not prove that isolation directly caused the outcomes or that a particular friendship activity prevents illness. Other health and social factors may influence both connection and outcomes.
Why it is included
Supports taking unmet connection needs seriously. Millywell’s friendship-planning ideas are practical suggestions, not tested treatments or promises of disease prevention.
Cuijpers P, Miguel C, Harrer M, et al. · World Psychiatry
What it found: The synthesis found that CBT improved depression outcomes compared with control conditions. Its apparent advantage over other psychotherapies was small and uncertain in additional analyses. The research supports having treatment choices, rather than presenting CBT as the only legitimate therapy or assuming one option is best for every person.
Who was studied, limitations & context +
Population or scope
409 depression-treatment trials across ages, care settings and treatment formats, totaling 52,702 participants; not exclusively adult women.
What to keep in mind
Studies differed in participants, control groups, formats and quality. Some comparisons contained few trials, and pooled results do not predict an individual response. This research addresses depression treatment; it does not diagnose depression or establish a treatment for workplace burnout.
Why it is included
Supports a conversation about therapy options and follow-up when low mood affects daily life. It helps keep the depression-care discussion separate from self-help advice for ordinary work stress.
Helena J. Teede and colleagues · Fertility and Sterility
What it found: The guideline brings diagnosis, menstrual concerns, metabolic health, emotional wellbeing and fertility into one care framework. It supports shared decisions rather than a single treatment for everyone, and recognizes weight stigma. Medication, lifestyle and supplement recommendations address different goals; evidence for an ingredient should not be confused with proof for a marketed blend.
Who was studied, limitations & context +
Population or scope
Adolescents and adults with PCOS; international clinical and lived-experience input.
What to keep in mind
Much of the underlying evidence remained low to moderate quality. Recommendations combine research, clinical expertise and patient preferences. They do not establish a personal prescription, prove that one diet is best, or support a universal supplement dose.
Why it is included
Provides the scientific framework for our PCOS diagnosis, testing, metabolic care and treatment questions. The original journal title uses PCOS; current society materials also use the newer PMOS name.
What it found: The task force found that available evidence could not establish the overall balance of benefits and harms of routine clinician visual skin screening in the population it considered. This is an uncertainty finding, rather than proof that screening helps everyone or that checking a suspicious change is unnecessary.
Who was studied, limitations & context +
Population or scope
Adolescents and adults without skin-cancer symptoms or a personal or family history of skin cancer.
What to keep in mind
The statement does not cover someone with a changing or otherwise concerning spot, or the excluded higher-risk histories. An insufficient-evidence conclusion is not advice to ignore symptoms and does not settle an individual clinician’s examination plan.
Why it is included
It helps distinguish the article’s advice to report changing spots from an unsupported promise that every adult needs the same annual full-body screening.
Tasuku Harada, Fuminori Taniguchi, Sun-Wei Guo and colleagues · Reproductive Medicine and Biology
What it found: The guideline considers imaging, symptom treatment, procedures and reproductive concerns together. It describes ultrasound and MRI as noninvasive diagnostic tools and emphasizes tailoring management to symptoms, age, reproductive circumstances and preferences. A finding of adenomyosis does not settle every treatment decision or mean that everyone should follow the same procedural route.
Who was studied, limitations & context +
Population or scope
Women with suspected or diagnosed adenomyosis, including those with ongoing pregnancy goals.
What to keep in mind
Studies use different diagnostic definitions and treatment approaches, and important fertility questions remain uncertain. Regional experience and available treatments influence the guidance. It should support a clinician conversation rather than be used to select a procedure independently.
Why it is included
Adds research context to our adenomyosis guide’s focus on bleeding, pain, imaging questions and fertility preferences. It helps explain why follow-up should address the person’s goals, not just a scan label.
Christian M. Becker, Attila Bokor, Oskari Heikinheimo and colleagues; ESHRE Endometriosis Guideline Group · Human Reproduction Open
What it found: The guideline organizes evidence on diagnosing endometriosis, managing pain, fertility care and recurrence. It updates the place of diagnostic laparoscopy and considers several routes through care rather than assuming one procedure answers every question. The aim is a plan matched to the symptoms and decisions that matter to the person seeking help.
Who was studied, limitations & context +
Population or scope
People with suspected or diagnosed endometriosis, including adolescents and those with fertility concerns.
What to keep in mind
The literature review included English-language papers through December 2020. Evidence strength varies across questions, with limited evidence for some options. A guideline cannot identify the cause of someone’s pelvic pain or replace assessment of a new severe symptom.
Why it is included
Explains why our endometriosis guide separates symptoms, diagnostic questions and treatment goals. It supports asking what each investigation or proposed treatment would change in the plan.
Edinger JD, Arnedt JT, Bertisch SM, et al. · Journal of Clinical Sleep Medicine
What it found: The guideline recommends multicomponent cognitive behavioral therapy for insomnia (CBT-I) for adults with chronic insomnia. It also advises against using sleep-hygiene education alone as the treatment. This helps distinguish a structured clinical intervention from a collection of bedtime tips or a more elaborate evening routine.
Who was studied, limitations & context +
Population or scope
Adults with chronic insomnia disorder, including populations with relevant medical or psychiatric conditions.
What to keep in mind
Recommendations guide clinicians, not self-prescribed sleep restriction. The appropriate approach depends on assessment, access, preferences and safety. A separate 2026 guideline addresses combining CBT-I with medication; it does not make an evening checklist equivalent to treatment.
Why it is included
Supports asking about CBT-I when insomnia persists. The Millywell evening organizer remains an optional planning aid, not a substitute for this treatment.
Jasmine Mah and Tyler Pitre · BMC Complementary Medicine and Therapies
What it found: The pooled evidence suggested that magnesium might shorten the time needed to fall asleep. It did not clearly establish an improvement in total sleep time. The authors judged the available research too weak for confident conclusions, making this a reason for caution about confident sleep-product promises.
Who was studied, limitations & context +
Population or scope
Three randomized trials involving 151 older adults.
What to keep in mind
The trials were small and short, with moderate-to-high risk of bias and low or very low certainty for their outcomes. Older-adult findings cannot establish a reliable magnesium-glycinate treatment for insomnia in women in their thirties or forties.
Why it is included
This supports the guide’s distinction between magnesium being an important nutrient and magnesium supplements being an established treatment for persistent insomnia.
What it found: The task force recommended beginning routine colorectal screening at 45 for average-risk adults and continuing through 75, using an appropriate stool-based or visualization strategy. The options have different repeat schedules and practical demands. An abnormal stool screening result requires follow-up colonoscopy for the screening process to deliver its intended benefit.
Who was studied, limitations & context +
Population or scope
Asymptomatic U.S. adults aged 45 and older at average colorectal-cancer risk, with defined personal and inherited-risk exclusions.
What to keep in mind
These recommendations concern screening without symptoms. Prior cancer, certain polyps, inflammatory bowel disease or inherited syndromes can change the plan. The statement does not determine an individual’s insurance coverage or replace evaluation of new bleeding.
Why it is included
It explains why the article separates a 45th-birthday screening discussion from a symptom visit, and why returning a home kit does not finish an abnormal-result pathway.
Liane Bolke, Gerrit Schlippe, Joachim Gerß and Werner Voss · Nutrients
What it found: The tested drink improved several skin measurements compared with placebo. It contained collagen peptides together with acerola extract, vitamin C, zinc, biotin and vitamin E. The trial therefore evaluated a combined formulation; its result cannot identify how much, if any, of the change came from collagen alone.
Who was studied, limitations & context +
Population or scope
72 healthy women aged 35 or older, studied over 12 weeks.
What to keep in mind
This was a small trial of one branded multi-ingredient product over a short period. It does not establish the same result for a different powder, isolate collagen’s contribution, or demonstrate treatment of joint problems.
Why it is included
Read alongside the newer review, this shows how a positive individual trial can coexist with uncertainty about collagen supplements as a category.
JoAnn E. Manson, Nancy R. Cook, I-Min Lee and colleagues; VITAL Research Group · The New England Journal of Medicine
What it found: The trial did not find a statistically clear reduction in its primary outcomes of major cardiovascular events or invasive cancer with the tested marine omega-3 supplement compared with placebo. That result challenges a blanket claim that adding an ordinary fish-oil supplement prevents these outcomes in generally healthy people.
Who was studied, limitations & context +
Population or scope
25,871 U.S. adults: men aged 50 or older and women aged 55 or older, in a primary-prevention trial.
What to keep in mind
Participants were older than Millywell’s core audience, and this trial tested a particular preparation and context. Its results do not settle every secondary outcome, dietary-fish question or use of prescription products in selected high-risk patients.
Why it is included
This helps explain why the omega-3 guide separates a food choice, an optional supplement and a specific clinician-directed treatment rather than treating them as interchangeable.
Robert W Morton and colleagues · British Journal of Sports Medicine
What it found: Across the included trials, extra protein alongside a resistance-training program produced additional average gains in muscle size and strength. The important context is that participants were training; this was not evidence that a protein powder builds muscle on its own or that adding ever more protein keeps increasing the benefit.
Who was studied, limitations & context +
Population or scope
Healthy adults in 49 randomized trials combining at least six weeks of resistance training with a protein-supplement comparison.
What to keep in mind
Participants, diets, products and training programs differed, and the findings do not set a personal target for every woman or someone with a medical condition. A correction is linked with the paper; some disclosed industry relationships also merit attention.
Why it is included
It supports discussing protein as one part of training and recovery, while preserving ordinary food, total intake and individual needs as the starting points.
Carpenter JK, Andrews LA, Witcraft SM, et al. · Depression and Anxiety
What it found: Across the included trials, CBT improved target symptoms compared with psychological or pill placebo conditions. Benefits differed across diagnoses and outcomes, and some people did not respond. The review supports discussing an evidence-based therapy while avoiding a promise that the same approach or number of sessions works for everyone.
Who was studied, limitations & context +
Population or scope
41 randomized studies involving 2,843 participants with diagnosed anxiety-related conditions, including panic disorder and generalized anxiety disorder.
What to keep in mind
This is a 2018 synthesis, not a complete account of later trials. Diagnoses, therapy methods and comparisons varied. It does not establish that a generic breathing exercise, worksheet or wellness app provides the treatment tested.
Why it is included
Provides research context for asking what a therapist treats, how the proposed approach fits the problem, and how response and continuing difficulties will be reviewed.
Lopez PL, Torrente FM, Ciapponi A, et al. · Cochrane Database of Systematic Reviews
What it found: The review suggests that ADHD-focused CBT can help some adults with symptoms in the short term, including when added to medication. It examined structured interventions, not whether buying a planner treats ADHD. Practical work supports can complement care, while persistent difficulties still deserve appropriate assessment and a coordinated plan.
Who was studied, limitations & context +
Population or scope
14 randomized trials involving 700 adults with ADHD, aged 18–65; some studies evaluated CBT alongside medication.
What to keep in mind
The review searched through June 2017. Evidence quality varied, samples were limited and long-term follow-up was sparse. It does not establish that all coaching, organizational products or informal workplace changes provide equivalent benefits.
Why it is included
Explains why learning practical skills may be part of ADHD care without treating task-management tips as a diagnostic test or replacement for professional treatment.
Chantale Dumoulin, Licia P. Cacciari and E. Jean C. Hay-Smith · Cochrane Database of Systematic Reviews
What it found: Pelvic floor muscle training improved leakage outcomes compared with no treatment or inactive controls, with particularly clear findings for stress urinary incontinence. The review supports including appropriately taught training in conservative care. It does not establish that the same exercise routine is suitable for every bladder symptom or every pelvic pain concern.
Who was studied, limitations & context +
Population or scope
Women with stress, urgency or mixed urinary incontinence in randomized or quasi-randomized trials.
What to keep in mind
Many trials were small, varied in their training programs and followed participants for less than a year. There was much less evidence for some incontinence subgroups. This older review does not resolve all questions about long-term benefit or individual exercise selection.
Why it is included
Supports asking about pelvic-floor assessment and learning an appropriate technique. It is not a reason to prescribe automatic Kegels for pain, urgency, or an undiagnosed pelvic problem.
What it found: The published statement supports different cervical screening approaches according to age, including Pap testing and HPV-based options. It weighs detecting important precancerous changes against additional testing and procedures. At this source check, the USPSTF still displayed this 2018 statement as its final recommendation and marked an update in progress.
Who was studied, limitations & context +
Population or scope
Asymptomatic people with a cervix covered by the statement; previous high-grade disease and certain higher-risk conditions are excluded.
What to keep in mind
An older final statement should not be mistaken for a newly issued recommendation. Other organizations may use different schedules, and newer test options need current clinical context. Previous abnormalities, immune compromise or symptoms require a different discussion.
Why it is included
It provides the scholarly source behind the article’s explanation of Pap and HPV testing while making the guideline’s date and population limits visible.
What it found: People reporting more activity generally had more favorable mortality associations across sitting-time groups. The analysis suggested that activity level mattered when interpreting prolonged sitting, rather than treating every seated hour in isolation. It adds context for making movement part of a day that also requires desk work.
Who was studied, limitations & context +
Population or scope
Adults in prospective cohort studies; analyses of sitting time and mortality included more than 1 million participants.
What to keep in mind
The underlying studies were observational and relied on reported behavior, so they cannot prove that activity cancels the effects of sitting. Confounding and measurement error remain possible. The study does not prescribe a personal daily exercise dose.
Why it is included
It supports the broader movement context around desk work, while keeping short comfort breaks distinct from a proven mortality-prevention treatment or a requirement to buy a standing desk.
What it found: The investigators compared short walks after meals with a single longer walk at different times. Postmeal walking improved short-term glucose measurements in this small older group, with a particular effect after dinner. The result is an example of why researchers study the timing of movement around meals.
Who was studied, limitations & context +
Population or scope
Ten inactive adults aged 60 or older with elevated fasting glucose, studied in a controlled crossover experiment.
What to keep in mind
Only ten older adults took part, and measurements were short term in a tightly controlled setting. The study cannot establish long-term disease prevention or the same effect in younger women, nor a universal rule to walk at a precise minute.
Why it is included
It gives the article a concrete study to explain, while reinforcing its flexible approach: useful movement can fit real life without treating one experimental schedule as a prescription.
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