NutriStack
Saw Palmetto and Tongkat Ali, a conflict.
Tongkat ali raises testosterone; saw palmetto reduces DHT conversion. Combined effects on prostate-relevant androgens are mixed.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Saw Palmetto and Tongkat Ali
- Pair type
- Conflict
- Evidence (highest tier)
- Emerging
- Source citations
- 1 source
- Stack Score effect
- −10 to your Stack Score (per scored conflict row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Conflict · Emerging evidence
Conflict
What is happening. Tongkat ali raises testosterone; saw palmetto reduces DHT conversion. Combined effects on prostate-relevant androgens are mixed.
Mechanism. Tongkat ali increases testosterone via LH-mediated mechanisms; saw palmetto lowers DHT via 5-alpha reductase inhibition.
Recommendation. Most men can use both, but track PSA and prostate symptoms in older men. Tongkat ali's testosterone effect is small in eugonadal users.
Sources (1)
- Tambi MI et al. Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster. Andrologia. 2012
Stack Score
How this pair moves the number.
Effect on the composite score
If both Saw Palmetto and Tongkat Ali are in the same stack, this pair applies −10 to your Stack Score (per scored conflict row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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