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Methylcobalamin is another non-prescription form popular in wellness settings, with more limited clinical evidence than hydroxocobalamin for treating true deficiency

In some cases, or for more rapid replenishment, intramuscular injections may be recommended

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But the recommended daily amount of vitamin B-12 for adults is only 2.4 micrograms (mcg)

The answer is because if the reason they are deficient is that they cannot absorb B12 from diet , then giving them supplements that need absorbing in the gut is not going to work well