Biohacking has gained a loyal following among men seeking to optimize physical performance, with a growing online community dedicated to DIY self-improvement methods. One of the latest trends involves men icing their testicles in an attempt to improve sexual health. The practice has been popularized by well-known biohacker Bryan Johnson, who claims to have four times the average sperm count and promotes daily sauna sessions while using an ice pack on his groin. However, medical experts say there is no scientific evidence that this technique works and caution against potential risks.
The Rise of Testicle Icing
A Reddit forum dedicated to this practice attracts 555,000 weekly visitors, where men share their experiences. One user reported doing 10-minute sessions three to four times a day with a reusable ice pack, claiming major improvement in morning erections and general horniness, which he attributes to increased testosterone. Another shared that after a year of icing, his blood test showed the highest testosterone levels he ever had, along with more powerful ejaculations and a significantly higher sex drive.
Does the Logic Hold Up?
The idea behind testicle icing is not entirely baseless. The NHS recommends wearing loose-fitting underwear when trying to improve sperm count, as tight underwear can raise testicular temperature and affect sperm quality. Dr. Azadeh Ovaici, a private GP, explains that the scrotum and testicles are sensitive to temperature and are meant to be about one to one-and-a-half degrees cooler than core body temperature, around 35°C. Dr. Hugh Coyne, GP and co-founder of Coyne Medical, adds that reduced sperm production can occur within one to two weeks of heat exposure, peaking at four to five weeks, and extreme cases can lead to complete absence of sperm production.
Evidence Lacking
Despite the logical basis, Dr. Ovaici states there is no evidence that actively icing testicles improves sperm health, testosterone levels, erections, or sex drive. She notes that cold causes vasoconstriction, which is the opposite of what is needed for erections. Dr. Coyne emphasizes that cryotherapy guidelines recommend limiting exposure to 10-minute sessions to avoid nerve damage or loss of muscle function. He stresses that the goal of scrotal cooling is to bring elevated temperatures down to normal physiological range, not to make the testes as cold as possible.
Risks and Recommendations
Dr. Ovaici warns never to apply bare ice directly to the skin, especially the scrotum, as it can cause skin damage. She advises that if one chooses to ice, it must be done daily multiple times to have any theoretical impact, and effects are temporary. Both doctors recommend safer alternatives: reduce alcohol, avoid smoking, and avoid activities that apply constant heat to the testicles, such as saunas or cycling. Dr. Ovaici concludes, 'More evidence points to avoidance rather than actively cooling. That's what it's really about.'
