Frequently asked questions Can you overdose on vitamin B12
As a sealed powder stored cold and dry, most last for several years
Gong YY, Wu CZ, Wu YS, Alfieri A, Xiang YC, Shi DX, Duan S, Zhang MF, Li XX, Sun YC, Chao J, Tester M, Shang Z, Forde BG, Liu LH (2025) A glutamate receptor-like gene AtGLR2.5 with its unusual splice variant has a role in mediating glutamate-elicited changes in Arabidopsis root architecture
Signs of bacterial contamination: Cloudiness (should be clear) Particles or floating material Unusual odor Color change Physical degradation signs Visual changes indicating degradation: Clear solution becomes cloudy Color change (especially copper peptides) Precipitation or crystals forming Separation of layers When in doubt: Discard
They are also being marketed in ways that often outrun the evidence
Administration and Dosage