注意：該製品可能使男性乳房增大，精子減少。當年腦白金盛行，如今偽娘當道。那個該殺的大山，亡我民族

Additional side effects include stomach cramps, dizziness, headache, irritability, decreased libido, breast enlargement in men (called gynecomastia), and reduced sperm count.

摘自

https://www.umm.edu/health/medical/altmed/supplement/melatonin

 

Other related articles

https://www.ncbi.nlm.nih.gov/pubmed/12065466

https://www.livestrong.com/article/232169-the-effects-of-melatonin-on-reproductive-functions/

 For men, breast enlargement (gynecomastia) and reduced sperm count are also possible.

from https://draxe.com/melatonin-dosage/?