Shilajit: what the trials actually tested
Testosterone and strength — not “daily wellness”.
Shilajit is a tar-like resin from mountain rock, sold here by Manna Vitality as 1,000 mg sachets with “91 essential nutrients”. Short answer: one small double-blind trial found higher testosterone in men aged 45–55 after 90 days; another found less strength loss after a tiring workout, but only in the stronger half of young men at the higher dose. We found no study of Manna.
How the evidence flows
Each claim (middle), the studies that tested it (left) — green found it, red found nothing — and the grade they add up to (right). Drawn from the same records as the grades below. Tap to open full size.
Shilajit (Manna) · evidence checked 2026-10-26
What the research shows
Grades are calculated from the studies listed, by fixed rules.
- Shilajit raises testosterone in middle-aged menPromising
One 90-day double-blind trial in healthy men aged 45–55 found higher total and free testosterone than placebo, at 250 mg twice a day. It has not been repeated, and the abstract does not give the number of men.
- Shilajit helps muscles keep their strength when tiredEarly evidence
In 63 young men, 500 mg a day for 8 weeks helped only the stronger half hold their strength after a tiring workout; the low dose did nothing. A subgroup finding.
- A Manna sachet’s 1,000 mg of shilajit and “91 essential nutrients” fuel your daily wellnessNo real evidence
The ad said “With Manna, you get 1000mg of Shilajit in a single dose! Each sachet has 91 essential nutrients to fuel your daily wellness…”
Manna Vitality · Facebook ad, seen Oct 2026
We found no study of Manna. A count of nutrients is not an amount: the ad does not say how much of any of them a sachet holds. The shilajit trials above used 250–500 mg doses, tested hormones and strength, not general “wellness”.
Before you buy
- Ask whether the product is third-party tested, and for how much shilajit a dose holds.
- If you think your testosterone is low, a morning blood test, repeated, is how to know.