The State of Supplement Evidence (2026)
Supplements are sold on the promise of science. We scored 583 of them on a transparent 0–10 evidence scale, built from 8,250 curated studies and 1,999 meta-analyses — and looked at what the evidence actually says.
The short version: the evidence is real, but heavily concentrated. A small core is well-supported and safe — most of the market is marketing more than science.
By Baher Al Hakim, Founder, SupStack · Published July 4, 2026 · Updated daily from the data
4%
have strong evidence
55%
limited or insufficient evidence
58%
backed by a meta-analysis
27%
weak evidence + safety caution
The evidence pyramid
Scored 0–10, the 583 supplements break down like this — the evidence is concentrated in a small core:
Strong22 · 4%
Moderate240 · 41%
Limited252 · 43%
Insufficient69 · 12%
The worst bets
Cross evidence with safety and the real problem appears: 27% (roughly 1 in 4) have both weak evidence and a safety caution.
223
Well-evidenced · safe
39
Well-evidenced · caution
166
Weak · safe
155
Weak · caution
Heavily researched, still unproven
42 supplements have 15+ studies and still don't reach 5/10. Popularity and study count aren't efficacy — some of the most-talked-about supplements land here:
The evidence-backed dozen
Just 12 supplements clear both bars — strong evidence (8+) and a high safety rating:
Popularity is not evidence
Multivitamin is the most-studied product in the corpus (44 studies) yet scores only 6/10. Being studied a lot and being shown to work are not the same thing.
The experimental-compound gap
About 37% of the supplements we track (215) are experimental or research compounds. They average 4.4/10 — and 20% don't even have enough evidence to be scored. The marketing energy is aimed squarely at the tier where the evidence is thinnest.
Rising supplements
Where the research is heading — the supplements with the most new studies in the last 3 years:
Which type has the best evidence?
The best-evidenced supplements are the boring ones — vitamins and minerals lead; the trendy tiers (mushrooms, peptides) trail. Average evidence score by type:
vitamin6.2 · n=26
mineral6.1 · n=18
amino acid5.7 · n=37
fatty acid5.7 · n=11
probiotic5.5 · n=15
botanical5.2 · n=144
compound4.6 · n=249
peptide4.6 · n=70
mushroom4.2 · n=9
Which health goals have the best evidence?
Map supplements to the goals they target and a pattern emerges: sleep and women’s health are best-evidenced — longevity, the trendiest area, is weakest. Average evidence score by goal area:
Women's Health6 · n=99
Sleep5.9 · n=44
Body5.5 · n=154
Mental5.4 · n=159
Men's Health5.4 · n=77
Performance5.3 · n=171
Beauty & Appearance5.2 · n=73
Vitality & Longevity5.1 · n=348
How solid is the evidence?
58% of supplements (336) are backed by at least one meta-analysis — the gold standard. And the evidence is human, not hype: the scores rest on 2,803 RCTs and 1,999 meta-analyses, and 75% of cited studies are human clinical research — only 6% are animal or in-vitro. The base is current too: the median cited study is from 2019, 42% from the last five years.
RCTs2,803
Meta-analyses1,999
Systematic reviews1,122
Other (observational, animal…)2,326
Safety is not a given
194 supplements (33%) carry a "use with caution" safety rating — for drug interactions, contraindicated populations, or dose sensitivity. "Natural" is not a synonym for "harmless."
Beyond the individual ratings, the corpus carries 416 documented drug interactions — 27% of supplements have at least one. St. John's Wort alone interacts with 24 medications:
Explore every supplement
All 583 supplements — search, filter, and sort by evidence, studies, or safety.
583 of 583
Common questions
Do supplements actually work?+–
Some do, but the evidence is concentrated. Of 583 supplements we scored, only 4% have strong evidence, while 55% are limited or insufficient. A small core is genuinely supported — most of the market is not.
Which supplements have the best evidence?+–
By type, vitamins and minerals lead. The "evidence-backed dozen" (strong evidence plus a high safety rating) includes Creatine, Whey Protein, Omega-3, Probiotics, Sunscreen (SPF).
Are "natural" supplements safe?+–
Not automatically. 33% carry a use-with-caution rating, and 27% have both weak evidence and a safety caution. St. John's Wort alone interacts with dozens of medications.
How are the evidence scores calculated?+–
On a transparent 0–10 scale weighting study quantity, quality (RCTs and meta-analyses over observational data), consistency, and effect size. Scores below 3 are treated as "insufficient evidence." The full methodology is public.
Which supplements are trending in research right now?+–
The ones with the most new studies in the last 3 years include Omega-3, Sulforaphane, Beta-Alanine, Inulin, Cistanche.
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Evidence distribution
Evidence × safety ("worst bets")
Best-evidenced health goals
How to read this (and its limits)
- ·The scores are our methodology, not universal truth — a transparent attempt to weight study quantity, quality, consistency, and effect size.
- ·"Insufficient evidence" means "not yet shown," not "disproven." A low score can rise as better studies appear.
- ·We score the evidence for documented effects — not every possible use of every supplement.
- ·These figures are a snapshot and update as the database grows.
Methodology & data+
SupStack scores each supplement on a transparent 0–10 scale weighting study quantity, study quality (RCTs and meta-analyses over observational data), effect consistency, and effect size. Scores below 3 are treated as "insufficient evidence." Every figure is computed live from 583 supplement records (snapshot July 4, 2026).
Related report
Significance Without Size: How Supplement Trials Report
Almost every trial reports a p-value — only one in six reports the effect size.
Use the data
Every score, study count, and safety rating is public — browsable and available via the free API for independent verification.
Cite this: Al Hakim, B. (2026). The State of Supplement Evidence [dataset]. SupStack. https://doi.org/10.5281/zenodo.21311542