The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
You can find evidence for all of these different features, both changes to the chemical milieu-- that is, the hormones-- and changes to the mechanical milieu, including, for instance, improvement of the pathways leading from the seminiferous tubules to the epididymis to the vas deferens, basically clearing out the plumbing so that more quality ejaculate can be delivered, which, of course, is going to increase the probability of fertilization.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Likewise, on the male side, acupuncture has been shown to improve semen volume, quality of sperm, sperm motility, et cetera, and in large part through changes in the neural pathways that innervate the very tissues and vascular input to the scrotum and testicles, because, as we learned earlier, temperature regulation of the scrotum and testicles is so vital for getting healthy sperm and increasing sperm quality.