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This is the most common question and the answer from a mechanistic standpoint is yes, they are complementary rather than redundant : BPC-157 works through nitric oxide and growth factors (gut-mediated) TB-500 works through actin mobilization and cell migration (structural) These are non-overlapping pathways, which is the theoretical basis for combining them

Fournel-Gigleux S, Sutherland L, Sabolovic N, Burchell B, Siest G

However, modification of Cys106 by DAQs has the most severe effects on DJ-1 protein structure and function, leading to DJ-1 aggregation [83]

Although I have not used it much yet, I can already see the results

doi: 10.1007/s00125-012-2644-8 48 RomanJZhuJRitzenthalerJDZelkoIN

However, some report mild nausea if taken on an empty stomach