Nature's Answer supplements, graded by the human studies
We graded 2 Nature's Answer 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 Nature's Answer makes, tests or sells its products, and we sell no supplements. Educational, not medical advice.
The Nature's Answer products we graded
Members Only2 products, strongest evidence first
What Nature's Answer products were graded for
Each goal links to its page, with every product graded for it
| Goal | Nature's Answer products |
|---|---|
| Bone Health | 1 |
| Hair Growth | 1 |
Read more
Our articles on these goals
- Peter Attia's Supplement List: What He Takes and What the Trials SayArticle · Sep 20, 2026
- Nature Made vs Nature's Bounty: Every Product We Graded, Side by SideArticle · Nov 2, 2026
- How to Build a Longevity Supplement Stack: An Evidence-First ReviewArticle · Sep 7, 2026
Questions people ask
Members Only
Is Nature's Answer a good brand?
We grade products, not brands, and we sell none. Of the 2 Nature's Answer products we graded, 2 are Tier 4 (Emerging). None is top-ranked for its goal yet. Each product's grade, the studies behind it and its label are on its own page.
Which Nature's Answer products have the strongest evidence?
By our grades: Horsetail Grass (Tier 4, graded for hair growth); Vitamin D3 25 mcg (1000 IU) & K2 120 mcg (Tier 4, graded for bone health). A product's grade is for the goal it was graded for, at the dose on its label.
How does Reverse Age Lab grade Nature's Answer products?
Each product is graded for a goal on the human studies of its ingredients at the dose on its label, what buyers say in their reviews and what our panel of ten biohackers has said. The grade belongs to the product. We do not grade how Nature's Answer makes, tests or sells its products, and we are not affiliated with Nature's Answer.
Can I take Nature's Answer supplements with my meds?
Some supplements can interact with meds. Members have every product checked against the meds in their Health Profile before it joins their protocol.
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. Nature's Answer is a trademark of its owner; Reverse Age Lab is not affiliated with it and sells no supplements. How we grade →
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