BCAA Supplements: Do They Lower Sex-Drive/Libido?

picture of lucas

Lucas Aoun

Founder @ BYB

May 9, 2020

Have you ever wondered whether BCAA supplements can negatively affect your libido or sex drive? Well they most definitely CAN... Depending on what they are combined with. BCAA’s compete with tryptophan for transport into the brain. So the higher the ratio of BCAA’s to typtophan, the less serotonin should be produced. BCAA’s also compete with tyrosine so they may also deplete dopamine.

Key Facts

As many of you are aware the BCAA compete for transport into the brain (and other cells maybe??) with tryptophan, tyrosine, and phenylalanine. So, if you raise the ratio of BCAA to the other acids less tryptophan will get into the brain/cells and thus less serotonin will be produced. There have been many studies testing this idea and at this point it has been pretty well established that it works.

The problem with this approach is that BCAAs will also deplete tyrosine, which is the amino acid from which dopamine is synthesized. So, the question scientists have been trying to answer is whether BCAA can be used to deplete serotonin only but leave dopamine unchanged. The reason for these tests is that in theory reducing serotonin and raising dopamine will have a positive effect on physical (and maybe) performance.

So, the attached study recently came out and it confirmed that one can reduce serotonin BUT keep dopamine intact (maybe even increase it a little) by ingesting a BCAA combo in the dosage 19mg/kg:12mg/kg:12mg/kg (leucine:isoleucine:valine) AND adding tyrosine at the dosage of 14mg/kg. To me this amounts to about taking 3500mg of BCAA and 1500mg tyrosine (Dinkov, 2020).

Remember these rules:
Low Dopamine = Low Libido.

Low Serotonin = High Libido.

High Dopamine = High Libido.

High Serotonin = Low Libido.

To ramp up Dopamine production, checkout this drug from Russia:

For more neurotransmitter hacks - Checkout this FREE sleep masterclass:



Join 30,000+ email subscribers.

  • Weekly updates on the latest biohacks.
  • Summaries of cutting-edge health research.
  • Short-form videos.
  • In-depth podcasts with expert guests.
  • Unsubscribe in one click if you want to opt out.
    No bullshit. No spam.