While many nootropic supplements are generally well-tolerated, individual responses can vary, and side effects such as headaches, digestive discomfort, dizziness, or sleep disturbances may occur, especially at higher doses or with prolonged use
A 2021 study by Zerbinati and colleagues tested a serum with 30% 3-O-ethyl-l-ascorbic acid and 1% lactic acid significantly increased collagen production, reduced UVB-induced DNA damage, and decreased melanin on a reconstructed pigmented skin model
Some people can experience problems related to a vitamin B12 deficiency, despite appearing to have normal levels of vitamin B12 in their blood
What Research Says About Oral Glutathione A randomized, double-blind, placebo-controlled study found that participants taking 500 mg of oral glutathione daily showed decreased melanin indices at all six measured sites after just 4 weeks of consistent use
NAM is left over as a by-product