Four Sigmatic supplements, graded by the human studies
We graded 2 Four Sigmatic products against the human studies of their ingredients, the dose on each label and what buyers say in their reviews. Each grade belongs to the product and the goal it was graded for: we do not grade how Four Sigmatic makes, tests or sells its products, and we sell no supplements. Educational, not medical advice.
The Four Sigmatic products we graded
Members2 products, A to Z
Members see each product's tier, its reviews and why. Start My 7-Day Free Trial →
What Four Sigmatic products were graded for
Each goal links to its page, with every product graded for it
| Goal | Four Sigmatic products |
|---|---|
| Immune Health | 1 |
| Muscle and Strength | 1 |
Read more
Our articles on these goals
- Peter Attia's Supplement List: What He Takes and What the Trials SayArticle · Sep 20, 2026
- How to Improve Gut Health Naturally: Fiber, Foods and the Probiotic Strains With Human TrialsArticle · Sep 15, 2026
- How to Build a Longevity Supplement Stack: An Evidence-First ReviewArticle · Sep 7, 2026
Questions people ask
Members
Is Four Sigmatic a good brand?
Answer for members.
Which Four Sigmatic products have the strongest evidence?
Answer for members.
How does Reverse Age Lab grade Four Sigmatic products?
Answer for members.
Can I take Four Sigmatic supplements with my meds?
Answer for members.
Members see the answers, checked against their own meds and goals. Start My 7-Day Free Trial →
Educational, not medical advice. Grades come from human studies on PubMed, the dose on each label, store reviews we read ourselves and our biohacker panel, and are updated as new studies arrive. Four Sigmatic is a trademark of its owner; Reverse Age Lab is not affiliated with it and sells no supplements. How we grade →