Best Supplements for Women: Mostly, Nobody Checked

Search this question anywhere else and you get the men’s list with a different colour scheme.

So we went back through every supplement verdict on this site and asked a duller question: who was actually in the trials?

The answer, for most of the shelf, is that nobody reported it separately. That is not a complaint about the supplements. It is a description of the evidence, and it is the single most useful thing we can tell you about it.

Nothing here is for sale. Every row goes to the verdict it came from. Where we cannot tell you something, we say so rather than guessing.

Where women were looked at separately, and there were too few to tell
WhatVerdictWhat we measured
Beetroot juice
It lowers resting blood pressure a little. On athletic performance, the review we read had 156 women among 1,335 volunteers: its estimate for women was positive but too imprecise to tell from nothing, and its own authors call that blank likely spurious.
supported3.55 mmHg
off resting systolic pressure, in 19 controlled trials
Where the trials were mostly women, and the evidence is not yet good enough
WhatVerdictWhat we measured
Creatine
Seven trials, every one of them in women past menopause. Under a pound of lean mass on a scan that counts water, in a pooled figure where three of the five trials found none; no leg-press or squat gain over lifting alone; and nothing like the bulk it is warned about.
preliminary3 of 5
trials behind the lean-mass figure found no gain in lean mass
Collagen
The rare case where the trials were mostly women — which is why the figure beside it is about who was studied, not what changed. The skin readings improved, but a company is named in 21 of the 26 trials and the trials disagree with one another.
preliminary95%
of the pooled participants were women
Checked, and it did not hold up for anybody
WhatVerdictWhat we measured
Fat burnersunsupported21
studies. not one without diet or exercise
Sea mossunsupported57
adults in a placebo trial that found no edge
NAD+ and NMNunsupported80 of 113
studies in the review were in rodents
Methylene blueunsupported26
healthy adults given one dose by mouth
Berberineunsupported14x
more weight lost on the drug than on the supplement named after it, each against people not taking it
Checked, but our verdict carries no separate finding for women
WhatVerdictWhat we measured
Proteinestablished0.66 lb
of extra fat-free mass in people who lift: 26 comparisons, 1,089 people, in a 2018 review
Vitamin Dpreliminary9% to 41%
of people in six big trials started below 20 ng/mL
Magnesiumsupported2.0
mmHg off systolic blood pressure, across 34 double-blind trials
Melatoninsupported7 min
faster to fall asleep in a 2013 pooling of adults and children; about 2 min in adults alone in 2022
Zincpreliminary2.4 days
shortened — at low certainty, and disputed
Colostrumpreliminary5
small trials in healthy volunteers behind the gut result; in one of them the marker rose on colostrum
Electrolytesunsupported9
studies pooled in 2026 — no consistent link between cramp and blood sodium or fluid loss
Krill oil, against fish oilpreliminary4
of the 64 pooled trials put krill oil and fish oil in the same trial
These verdicts stand as written. What they do not carry is a result reported separately for women — so on that specific question, we cannot tell you, and neither can anyone quoting the same trials.

The pattern is the finding. Very few verdicts on the whole supplement shelf have something specific to say about women, and in one of those the women were too few for the review to tell anything.

That is not us being cautious. It is what happens when you go and count.

If a page tells you which supplements women should take and does not mention who was in the studies, it is not answering the question — it is answering the men’s question and hoping you will not notice.

The same corpus, asked two other ways: for muscle growth and for men, where the trials did match the reader and it changed less than you would hope — and for gut health. There is also one for recovery, and for weight loss, where nothing reaches Established for weight loss, and for sleep, where exactly one entry is Supported and what it buys is measured in minutes, and for sweeteners, where every claim is a worry and the ratings run backwards.

The four ratings are the same ones used on every verdict here, and we wrote down how we read a study so you can see what earns each one.