had b12 injection but still tired Vitamin A Vitamin B12 is a quick shot that gives your body vitamin B12 directly into the muscle. This helps your body absorb it faster than tablets. Vitamin B12 helps I Feel Tired All the
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Moreover, increased VitB12 levels in patients with insomnia were closely correlated with the use of mecobalamin

Some of the most notable ones include:

Rodrguez Cetina Biefer H, et al

doi:10.3945/an.117.015628

Amylin decreases meal size in rats

Those who suffer from other dietary distresses like Crohns or stomach ulcers are also more likely to have low levels of Vitamin B12 absorption due to their illness and even their medications
