I am not assuming that IM8 users are gym goers but certainly they are interested in positive health outcomes
They are not interchangeable
Idiopathic vitiligo is a genetic and chronic autoimmune disease that progressively destroys the skin melanocytes, resulting in the appearance of patchy depigmentation (Rodrigues et al
Therefore, if you start using niacinamide-containing products and then develop a breakout, it is likely not a purging but rather an adverse reaction to the substance, such as irritation or clogging (depending on the product's formula), which is irritating the skin and resulting in a breakout
Nunes, S
Phytother Res 35(1):392403 Chen C-Y, Tung H-Y, Tseng Y-F, Huang J-S, Shi L-S, Ye Y-L (2022a) Verbascoside and isoverbascoside ameliorate transforming growth factor 1-induced collagen expression by lung fibroblasts through Smad/non-Smad signaling pathways