Compound Library

Supplement / Testosterone Support

Tongkat Ali (Eurycoma longifolia)

Southeast Asian herb that reduces SHBG and cortisol — increasing free testosterone without directly stimulating LH/FSH. Clinical trials show modest testosterone increases (15–40%) in hypogonadal men and high-stress individuals. Popular natural testosterone optimizer.

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Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.
Reference dose400–600mg standardized extract (2% eurycomanone) daily.
Half-life8 hours
Risk flaglow
Regulatory noteReview required

Side effects and watch-outs

  • Generally very well tolerated
  • Insomnia (take in morning)
  • Mild irritability
  • Restlessness