BONUS: How To Reverse Testosterone Decline After 40 (Biohacking Tips)
Dave Asprey
14 sept 2025
Mindsip insights from this episode:
Challenge myth of lifelong testosterone replacement therapy
It is a myth that you must be on testosterone replacement therapy for life once you start, as you can still improve your natural production.
Switch to oral testosterone undecanoate for convenient treatment
A new oral form of testosterone called testosterone undecanoate (brand name Kyzatrex) is a game-changing alternative to injections.
Go to bed before 10 PM to boost testosterone production
Testosterone production ramps up during your early night sleep cycles, so going to bed late will savage your levels.
Prioritize sleep to maintain testosterone levels
Just one night of poor sleep can drop your testosterone levels by as much as 15%.
Monitor morning erections to assess testosterone health
Your morning erection is a direct and free signal from your endocrine system that your testosterone is functioning properly.
Recognize cholesterol as essential for testosterone production
Contrary to mainstream media, cholesterol is the literal building block for your most important male hormone, testosterone.
Eliminate hormone disruptors to protect testosterone levels
Everyday items like plastic containers, tap water, and scented detergents contain hormone disruptors that are slowly lowering your testosterone.
Get morning sunlight to boost testosterone levels
Getting 5-10 minutes of natural sunlight in your eyes within 30 minutes of waking triggers a hormonal cascade that starts building testosterone.
Use TrueDark glasses after sunset to protect testosterone
To protect testosterone, use TrueDark glasses after sunset, as standard blue-blocking glasses are not enough to filter all disruptive light.
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