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The most discussed effects are sexual in nature: a subset of users report reduced libido, erectile dysfunction, and ejaculatory changes in approximately two to four percent of users in clinical trials, though real-world reporting and patient advocacy groups suggest this number may undercount persistent cases [6]

Zhan, K., Yang, T

Nutrients 9(3):E290 Carneiro MFH, Barbosa F Jr (2016) Gold nanoparticles: a critical review of therapeutic applications and toxicological aspects

Possible monitoring points include injection site irritation, flushing, headache, water retention, fatigue, appetite changes, or hormone-related effects