They tend to show up as a general daily drag: things that are easy to attribute to stress, aging, or just a rough stretch
Safety and Excess Intake Vitamin B12 has an excellent safety profile , with the UK Expert Group on Vitamins and Minerals providing a guidance level of 2,000 micrograms per day for supplemental intake
Nabi R, Alvi SS, Shah A, Chaturvedi CP, Iqbal D, Ahmad S, et al
Zhou, P., Tian, F., Lv, F
Athletes and people with an interest in exercise often use creatine supplements to boost athletic performance and strength
Investigations into additive or supra-additive effects on GH/IGF-1 output, metabolic rate, and tissue responses in controlled models are facilitated by the combination