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But theres no definitive research that proves why a drop in testosterone may have this effect

Numerous skin aging treatments exist, and mostly consist of topical products (e.g., retinoids, -hydroxyacids, broad-spectrum sunscreens, and antioxidant/anti-inflammatory agents, such as preparations containing vitamin C, vitamin E, and niacinamide6) and invasive or minimally invasive procedures (e.g., ablative and nonablative laser therapy, intense pulsed light therapy, radiofrequency, dermabrasion, and chemical peels)

doi:10.1001/jamapsychiatry.2018.3126 152

Eventually, Robert Keller MD took over and started selling the supplement we have today

Chen, L., Jia, L., Zhang, Q., Zhou, X., Liu, Z., Li, B., et al., Anaerobe , 2017, vol