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 the evidence really is about women
WhatVerdictWhat we measured
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.
supported95%
of the pooled participants were women
Creatine
Seven trials in postmenopausal women. Small gain in lean mass, considerably more on a leg press, and nothing like the bulk it is warned about.
supported0.8 lb
of lean mass, over a median of nine months
Where women were looked at separately, and the answer changed
WhatVerdictWhat we measured
Beetroot juice
It lowers blood pressure. But the athletic-performance effect was not observed in studies of women only — which is worth knowing before buying a shot for a race.
supported3.55 mmHg
off systolic pressure, across 22 trials
Checked, and it did not hold up for anybody
WhatVerdictWhat we measured
Fat burnersunsupported21
trials. the effect crossed zero
Sea mossunsupported4
toxic heavy metals the NIH record names in sea moss
NAD+ and NMNunsupported80 of 113
studies in the review were in rodents
Methylene blueunsupported1
FDA-approved use, and it is a poisoning antidote
Berberineunsupported17x
more weight lost on the drug than on the supplement named after it
Krill oil, against fish oilunsupported12
men in the absorption study the whole category cites
Checked, but our verdict carries no separate finding for women
WhatVerdictWhat we measured
Proteinestablished0.66 lb
of extra fat-free mass, across 49 trials and 1,863 people
Vitamin Dsupported2 trials
found almost nothing, in mostly-replete people
Magnesiumsupported2.0
mmHg off systolic blood pressure, across 34 double-blind trials
Melatoninsupported7 min
faster to sleep, pooled across trials
Zincpreliminary2.4 days
shortened — at low certainty, and disputed
Colostrumpreliminary60 g
a day, in the one trial that moved body fat — by 0.4%
Electrolytesunsupported18
case reports — the evidence that salt loss causes cramp
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. Three verdicts out of the whole supplement shelf have something specific to say about women, and one of those is a case where the effect went missing.

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.

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.