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(PubMed) Pangilinan F, Mitchell A, VanderMeer J, et al

The effect is dose-dependent and peaks when exercise duration exceeds 30 minutes, the threshold where intramuscular triglyceride stores deplete and circulating FFAs become the primary fuel source

The generic products have the same ingredients

While it might be rare, some people may have an allergic reaction to B vitamins that leads to emergency symptoms

European Journal of Nutrition