For acne scars specifically, we are talking about the flat dark marks (usually brown or red) left after a pimple resolves, not deep pitted scars (which glutathione wouldnt affect since those involve skin texture, not pigment)
Albeit not mutagenic, kava extracts are considered possibly carcinogenic to humans due to sufficient evidence obtained in experimental animals [6]
W.PaulB.BeckmanJ
Brandenburg K, Garidel P, Fukuoka S, Howe J, Koch MH, Gutsmann T, Andr J: Molecular basis for endotoxin neutralization by amphipathic peptides derived from the -helical cationic core-region of NK-lysin
Finally, the fermentation was scaled up in a 5-L fermentor, and the highest titer and yield were improved to 5680 mg/L and 45.13 mg/g, respectively, by optimizing the addition conditions of amino acids (40 mM added after 40 h)
89 ZhaoF