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  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    11/

    Sources:
    [1]
    [2]
    [3]
    [4]
    [5]
    [6]

    Nov 4, 2024 96 1 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    7/ Risks and side effects of semen retention:
    Semen retention can pose significant health risks for some men, including:

    + Disturbed sleep
    + Mood swings and frustration
    + Increased prostate inflammation and a higher long-term risk of prostate cancer, as frequent ejaculation…

    Nov 4, 2024 110 5 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    8/ Should you practice semen retention?

    The only valid reason to retain semen for a week or longer is if you have:

    + low sperm count motility, or quality and are struggling to conceive.

    In this situation, avoiding ejaculation for a week before intercourse or sperm donation…

    Nov 4, 2024 92 3 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    9/ Currently, there’s no scientific evidence supporting increased spermicide or testosterone levels in humans due to semen retention. Even if any marginal benefits do exist, they can be more easily achieved through supplementation, without the unnecessary risks and discomfort…

    Nov 4, 2024 82 0 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    4/ Does semen retention enhance sperm quantity and quality?

    A meta-analysis of 30 studies found solid evidence of improved sperm count and motility after 6-7 days and more than 7 days of abstinence.

    This might be the only evidence-based benefit of semen retention.

    While the…

    Nov 4, 2024 124 3 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    5/ Does semen retention increase spermidine levels in the body?

    Spermidine is a naturally occurring molecule produced by our cells, known for activating self-repair and maintenance pathways like autophagy, which has made it popular in longevity supplements.

    As its name…

    Nov 4, 2024 75 1 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    6/ Some popular health blogs (4) —though not peer-reviewed—have connected this fact to spermidine's role as a longevity molecule, suggesting it could theoretically increase spermidine levels.

    Just because a molecule is present in the semen doesn’t mean that retaining the latter…

    Nov 4, 2024 69 0 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    2/ Advocates claim semen retention can:
    + Increase testosterone
    + Improve sperm quality
    + Boost natural spermicide levels

    Here’s what science really says about it:

    Nov 4, 2024 81 5 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    3/ Does semen retention really boost testosterone levels?

    The evidence is weak; the only supporting study has been retracted [1]

    In fact the contrary is somewhat true, as arousal and ejaculation are associated with a temporary spike in testosterone, with levels returning to…

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    Nov 4, 2024 104 0 View on X
  • Bryan Johnson
    Bryan Johnson @bryan_johnson

    No Nut November is here.

    Rooted in ancient Taoist practices and Medieval chivalry, it’s gone viral among men worldwide.

    Here’s what’s scientifically sound—and what’s pseudoscience.

    🧵

    Tweet media
    Nov 4, 2024 1412 78 View on X
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