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( 3 ) Signs and Symptoms of B12 Deficiency Low B12 levels dont always scream for attention at first
References: Mark Heffernan, Roger J
Oral vitamin B12 absorption drops sharply at higher doses
As vitamin B12 is especially found in animal protein, this method can be helpful for vegetarians, vegans, and others who have little or no natural source of the vitamin
B12 shots use intramuscular injection, depositing vitamin B12 directly into muscle tissue, typically in the upper arm or thigh
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