glp 1 precursor Proglucagon is a molecule giving rise to GLP-1, GLP-2 and OXM GLP-1 Reporter Cells | Incretin

Given the rapidly changing regulatory landscape, this question protects you from unknowingly using a product from a non-compliant source

[5] In summary, pyridoxine may decrease the efficacy of certain medications (notably levodopa and some anticonvulsants), and various drugs can in turn precipitate vitamin B deficiency

And the sourcing situation is a legitimate concern that most influencers aren't being honest about

Biological effects and metabolic rates of glucagonlike peptide-1 736 amide and glucagonlike peptide-1 737 in healthy subjects are indistinguishable

Available from: Cabezas R, vila M, Gonzalez J, El-Bach RS, Bez E, Garca-Segura LM, et al