The most studied dietary supplements in the world: our PubMed count, 1970-2026
Irati Production counted, ingredient by ingredient, the human clinical trials indexed in PubMed since 1970. The result: 32,984 trials across 16 ingredients, a clear ranking, and three ingredients rising far faster than the rest. Here are the figures, the method, and what they mean for a brand.
Contact us
- Vitamin D: 5,753 clinical trials, number one since the early 2010s
- Probiotics (4,692) and omega-3 (4,568) complete the podium
- Magnesium was number one in 2000; it remains 4th with 3,367 trials
- Since 2014: ashwagandha ×6, collagen ×5, turmeric ×4.5
- PubMed count of 7 November 2026, reproducible by anyone
The ranking of 16 ingredients
Each bar shows the number of clinical trials and randomised controlled trials in humans, published between 1970 and 7 November 2026, whose title or abstract mentions the ingredient. Vitamin D alone has more trials than collagen, ashwagandha, spermidine, coenzyme Q10, turmeric and vitamin B12 combined.
Source: PubMed, National Library of Medicine, queries run on 7 November 2026 by the Irati Production R&D team. Filters: Clinical Trial or Randomized Controlled Trial, Humans, 1970 to 2026.
The full table, with the forms we manufacture
The same ranking, with the forms in which Irati Production manufactures each ingredient in Saumur: capsules, tablets, powders or pectin-based gummies. All of them exist in our standard formula range, ready to launch under your brand.
| Rank | Ingredient | Human clinical trials (1970-2026) | Forms we manufacture |
|---|---|---|---|
| 1 | Vitamin D | 5,753 | capsules, gummies, tablets |
| 2 | Probiotics | 4,692 | capsules, powder |
| 3 | Omega-3 | 4,568 | capsules, gummies |
| 4 | Magnesium | 3,367 | capsules, tablets, powder |
| 5 | Zinc | 3,213 | capsules, tablets |
| 6 | Vitamin C | 2,878 | tablets, gummies, powder |
| 7 | Melatonin | 1,628 | capsules, gummies |
| 8 | Iron | 1,604 | capsules |
| 9 | Creatine | 1,596 | powder, capsules, gummies |
| 10 | Whey protein | 1,096 | powder |
| 11 | Vitamin B12 | 1,062 | capsules, tablets, gummies |
| 12 | Turmeric (curcumin) | 645 | capsules |
| 13 | Coenzyme Q10 | 585 | capsules |
| 14 | Collagen | 162 | powder, gummies, capsules |
| 15 | Ashwagandha | 70 | capsules, powder |
| 16 | Spermidine | 65 | capsules |
What the ranking really says
The number of trials does not measure how effective an ingredient is. It measures how much attention research gives it, and therefore how much data exists on its effects, useful doses and limits. Vitamin D is heavily studied because insufficiency is common in winter in the northern hemisphere and concerns almost the whole population. Probiotics and omega-3 followed the same path: a public health topic, hundreds of teams, thousands of trials.
At the other end, spermidine (65 trials) and ashwagandha (70) are young ingredients. Few studies does not mean no effect, but a thin evidence base: a brand launching them must stick strictly to authorised claims and explain what is known, and what is not yet.
Three ingredients rising much faster than the others
Comparing the number of trials published each year with 2014, three ingredients stand out: ashwagandha, whose yearly pace has grown sixfold, collagen, fivefold, and turmeric, four and a half times. These are the three topics where clinical research is accelerating most, and where the coming years will bring the most new data.
For a brand this is launch information: an ingredient rising in research usually rises in Google searches a few years later. Irati Production already manufactures all three: collagen as powder, gummies and capsules, ashwagandha in capsules, and turmeric in capsules.
How to read a study on a dietary supplement
Four questions are enough to judge a study before quoting it. Who: healthy adults, athletes, deficient people? A result obtained in deficient people does not transfer to everyone. How many: the number of participants; below a few dozen, the result is fragile. How: a randomised placebo-controlled trial is worth more than an observational study. What dose and for how long: the measured effect depends on both.
This is exactly what our regulatory service does before a claim appears on a label: only claims authorised in the European Union, with their dose conditions, may be written. Everything else is information, not labelling.
The method, so anyone can repeat the count
Database: PubMed (National Library of Medicine, United States), queried on 7 November 2026. For each ingredient, the term and its usual synonyms were searched in the title or abstract. Two filters were applied: publication type "Clinical Trial" or "Randomized Controlled Trial", and species "Humans". The period runs from 1970 to 7 November 2026. Totals are cumulative; yearly rates were used to spot the ingredients accelerating since 2014.
Limits: one trial may mention two ingredients and be counted twice; trials not indexed in PubMed are not counted; the count moves every week with new publications. The 32,984 trials are therefore a solid order of magnitude, not a frozen figure. We will repeat this count every year.
Manufacturing what the science supports
Irati Production manufactures all 16 ingredients in this ranking in Saumur, France, in its 5,000 m² ISO 22000 certified and FDA registered facility, as ready-to-launch standard formulas or custom developments.
- Capsules in sizes 1, 0 and 00 on 3 encapsulation machines
- Tablets, including chewable tablets, on 2 tablet presses
- Powders and powdered drinks, 4 blending rooms
- Pectin-based gummies, gelatin-free, 2 production lines
- Regulatory check of every claim before labelling
Our answers on the most studied supplements
What is the most studied dietary supplement in the world?
According to Irati Production's PubMed count (7 November 2026), vitamin D ranks first with 5,753 human clinical trials published since 1970, ahead of probiotics (4,692) and omega-3 (4,568). Irati Production manufactures vitamin D in capsules, pectin-based gummies and tablets.
How did Irati Production count the studies?
For each ingredient, we queried PubMed (National Library of Medicine) with the term in the title or abstract, filtered on clinical trials and randomised controlled trials in humans, from 1970 to 7 November 2026. Anyone can reproduce the count with the same filters.
Is a heavily studied ingredient necessarily effective?
No. The number of trials measures research interest, not effect size. Vitamin D is heavily studied because deficiency is common; results depend on dose, duration and population. Only health claims authorised in the European Union may appear on a label, and Irati Production checks them for every formula.
Why do collagen and ashwagandha have so few studies?
They are recent in clinical research: 162 trials for collagen and 70 for ashwagandha. But their pace has surged since 2014 (collagen ×5, ashwagandha ×6). Irati Production manufactures collagen as powder, gummies and capsules, and ashwagandha in capsules, with the precautions recommended by the French agency ANSES.
How can a brand use this ranking?
To choose its launches: a heavily studied ingredient reassures consumers and makes the story easier to tell, while a fast-rising ingredient opens a position to take. Irati Production offers 105 ready-to-launch standard formulas on these ingredients, in capsules, tablets, powders and gummies, made in Saumur, France.
PubMed, National Library of Medicine (queries of 7 November 2026) · Regulation (EU) No 432/2012, list of permitted health claims · Regulation (EC) No 1924/2006
The information in this article is general and does not constitute regulatory advice. Each formula is subject to a technical and regulatory feasibility study.