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b12 injection into muscle How to Administer an Intramuscular at Home Vitamin B12 A Vitamin B12
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Without it, mice had normal blood vessel formation in fat tissue but reduced fatty acid uptake, resulting in smaller fat depots
Health Expect 2021;24:87-94

They also achieve higher blood concentrations than typically possible with oral supplements

[Crossref] Chen HQ, Li X, Tang R (2015) Effects of Narrow Band Ultraviolet B on Serum Levels of Vascular Endothelial Growth Factor and Interleukin-8 in Patients with Psoriasis
Example: a 5 mg (5,000 mcg) vial reconstituted with 2 mL yields 2,500 mcg/mL