why do we need b12 injections vs Pills: Richmond's Complete Guide The Science Behind Vitamin B12:

The only way to really know if you've taken too much vitamin B12 Apparently, there are, in fact, some things that can go wrong if you take too much vitamin B12, from a minor headache to a severe allergic reaction, depending on your own personal risk profile

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5-Amino-1MQ oral and subcutaneous route comparison Factor Administration Oral capsules Capsule taken by mouth Subcutaneous injection Reconstituted solution placed under the skin Factor Commonly discussed research amounts Oral capsules 50 to 150 mg per day in community reports Subcutaneous injection 2.5 to 5 mg per day in community reports Factor Frequency Oral capsules Once daily or split between morning and midday Subcutaneous injection Usually discussed as once daily, with some split examples Factor Absorption evidence Oral capsules 38.4% oral bioavailability in one rat study

It puts vitamin B12 straight into your blood, skipping the usual digestion steps