There are no peer-reviewed, controlled clinical studies verifying these claims. Any evidence remains anecdotal or testimonial.

Jelqing: Benefits, Side Effects, Technique, and More - Healthline

Jelqing is a manual penis stretching exercise that involves a repetitive "milking" motion intended to increase length and girth. Despite its presence in online communities and claims of ancient origins, it is not recommended by medical professionals due to a lack of scientific evidence and significant risks of permanent injury.

The practice involves manually massaging the tissues of a semi-erect penis. Proponents suggest that this process creates "micro-tears" in the penile tissue, which then heal thicker and longer—a theory similar to muscle hypertrophy in weightlifting. However, medical experts note that the penis is composed of smooth muscle and spongy tissue, which does not respond to stress in the same way as skeletal muscles like biceps.

The only methods with proven safety and efficacy for penile enlargement are: