l carnitine safety and side effects L-Carnitine | Linus Pauling Institute
Description
Lightens Skin: Reduces dark spots, pigmentation and uneven skin tone

Testing is recommended but not always required

On the other hand, Zn toxicity, competes with necessary element absorption, stimulates the generation of reactive oxygen species, and results in heavy metal toxicity (Zhang et al., 2020)

Antioxidants, 9 (7), 624
