Although dairy and meat products are usually considered good food sources of vitamin B12, the actual B12 levels contained in these products tend to vary greatly, as livestock is regularly supplemented with B12 injections to avoid deficiencies, making for a less than reliable (and natural!) source
If pregnant, nursing, or taking prescription drugs, consult your healthcare professional prior to use
Kerkhofs M, La Rovere R, Welkenhuysen K, Janssens A, Vandenberghe P, Madesh M, et al
Get it wrong, and you could compromise the integrity of your entire experiment, leading to inconsistent data and wasted resources
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