does b12 injections help with hair growth in Texas & Louisiana Vitamin B12 and Hair Loss:

Vitamin B12 supplements (not clear if this refers to physiological or pharmacological doses) lower the blood levels of homocysteine in the blood, which may be linked to increased risk of stroke or heart attacks, although the relation between vitamin B12 supplementing and lower rates of heart attacks has not been confirmed

Weeks 1-2: Metabolic Initiation During the first two weeks, the primary changes occur at the cellular level and may not be subjectively noticeable

How amounts of B vitamins in supplements compare to the amounts you actually need - the results may surprise you

It plays a role in promoting fat oxidation, improving glucose utilization, and supporting exercise performance in preclinical and early human studies