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This can occur if (1) the stem cells that make those cells are depleted, or (2) the pigment-producing cells themselves are damaged (and thus can no longer produce pigment)
US patent 12,280,089 Ruan X, Yu J, Miao H, Li R, Tong Z
On one hand, most studies remain in the stages of compound isolation, identification, and in vitro activity screening, verifying their protective effects on lung epithelial cells, macrophages, etc., through cell experiments or extracellular enzyme experiments, while in-depth in vivo studies are relatively scarce
Zinc helps in the maintenance of good health
It is produced by the liver and is involved in tissue building and repair
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