The regulations also stipulate that the level of Vitamin B12 in products must not exceed one Recommended Dietary Allowance (RDA) except in specific categories such as Food for Special Medical Purposes ...
A 4-ounce raw serving contains 67 micrograms (mcg) of B12, nearly 3,000% of the recommended dietary allowance (RDA) for adults. Beef liver is also an excellent source of vitamin A, other B ...