Does Tongkat Ali interact with Ashwagandha KSM-66?

Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Take together· moderate evidence

Testosterone and cortisol.

Tongkat ali supports androgens and libido, while ashwagandha lowers cortisol and stress, which itself can suppress testosterone, so the pair pushes testosterone up while easing a stress-related brake on it.

What to do

A common men's-vitality stack, taken daily and given several weeks. Take ashwagandha with food, check with a doctor if you have thyroid disease since ashwagandha can affect it, and get persistent low energy or libido medically assessed.

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Tongkat Ali
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Ashwagandha KSM-66
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Common questions

Can I take Tongkat Ali and Ashwagandha KSM-66 together?
Take together. A common men's-vitality stack, taken daily and given several weeks. Take ashwagandha with food, check with a doctor if you have thyroid disease since ashwagandha can affect it, and get persistent low energy or libido medically assessed.
Why do Tongkat Ali and Ashwagandha KSM-66 interact?
Tongkat ali supports androgens and libido, while ashwagandha lowers cortisol and stress, which itself can suppress testosterone, so the pair pushes testosterone up while easing a stress-related brake on it.

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Educational use only, not medical advice. Interaction risk depends on dose, your health, and any medications. Always consult a qualified clinician, especially if you take prescription drugs or are pregnant or nursing.