Does NoFap (semen retention) boost testosterone?

The claim

One of the most repeated numbers in the semen-retention corner of the manosphere is that abstaining from ejaculation raises testosterone by 45% after seven days — and that this hormonal surge is why "retention" supposedly delivers energy, focus, confidence and success with women. The claim travels as a hard scientific fact, often with a citation attached to make it look settled. This page checks whether the testosterone claim itself holds up. It is a claim about the human body, so the wording is kept close to what the sources actually say.

Who says it

The testosterone-boost claim is pushed mainly by semen-retention and NoFap self-improvement influencers, and by the short-video accounts that recycle the "45% in seven days" statistic as a reason to abstain. ^[4] It is worth separating two things that often get merged. NoFap LLC — the company Alexander Rhodes founded in 2011 and trademarked in 2013 — describes itself as helping people break pornography "addiction" by temporarily abstaining from masturbating, and is most associated with the jokey No Nut November challenge. ^[4] The specific promise that abstinence meaningfully raises testosterone is a claim of the wider retention culture rather than the brand's core pitch, and it is that hormonal claim, not the company, that this page tests.

The strongest version

What the evidence shows

Where the "45% in seven days" number comes from

The figure traces to a single 2003 paper in the Journal of Zhejiang University Science, which followed 28 volunteers and reported that serum testosterone peaked on the seventh day of abstinence at 145.7% of baseline — the "45% increase" of the meme. ^[2] Two things about that study matter more than the headline number. First, the peak was transient: reviewing it in The Conversation, biochemistry lecturer Daniel Kelly noted it was a spike that fell back down.

a temporary peak which then returned to the same levels as before, even with continued abstinence

^[1]

Second — and decisively — that 2003 paper has been retracted. The journal's 2021 retraction note states that the Editor-in-Chief withdrew it because it significantly overlapped with a previously published Chinese-language article, and two of the authors agreed to the retraction. ^[3] The PubMed record now carries the retraction notice directly. ^[2] The single most-cited piece of "evidence" for the testosterone claim is a withdrawn study.

What a reviewer of the whole literature concluded

Kelly did not rest on that one paper. Looking at the evidence base as a whole, he found it small and mixed, and his summary judgement was direct.

there is no reason to believe that nofap will meaningfully boost your testosterone levels

^[1]

He went further on the broader promises. Where men do feel better after quitting compulsive pornography use, the more plausible mechanism is psychological — relief from guilt-driven stress — rather than a hormonal transformation. ^[1] In his words, "health benefits of nofap are anecdotal and evidence to show abstinence even alters testosterone at all is simply not there." ^[1]

The wider frame the claim sits in

The testosterone story does not stand alone; it is the biological-sounding anchor for a movement whose central premise — a pornography "addiction" that abstinence cures — is itself disputed. Pornography addiction is not a recognised diagnosis in the major diagnostic standards, therapists note little medical evidence for the changes NoFap promises, and Prause's research found no scientific basis for the addiction framing. ^[5][4] None of that means quitting compulsive pornography use is a bad goal, or that nobody feels better for it. It means the specific, falsifiable claim — that abstinence meaningfully raises testosterone — is the part that fails.

Verdict

False. As a claim about the body, "NoFap boosts your testosterone" does not survive contact with the evidence. The famous "45% in seven days" figure comes from a single small study that measured a temporary peak returning immediately to baseline, was never replicated, and has since been retracted for duplicate publication — so the movement's headline statistic now cites a withdrawn paper. The one expert to review the wider literature for a general audience concluded there is no reason to believe abstinence meaningfully raises testosterone, and that the evidence it changes testosterone at all is not there. That leaves the promised cascade — energy, drive, dominance flowing from a hormonal surge — without a hormonal surge to flow from. People are free to abstain, and some will feel better for reasons that look psychological rather than endocrine. But the testosterone claim, stated as biology, is false.