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Zhang, S., Wang, J., Liu, Q

So the benefit is real, but it is indirect and it depends on whether you were low to begin with

Designed to provide your body with a natural boost, B12 injections help to increase your energy levels, and can help to regulate your sleep, appetite, and mood cycles

10.1038/s41580-020-00313-x 24 DoenchJ

Mouse fibroblast cells NIH/3T3 (SCSP-515), mouse fibroblast cells L-929 (SCSP-5039) and mouse macrophage cells RAW 264.7 (SCSP-5036) were purchased from Chinese Academy of Science Cell Bank for Type Culture Collection (Shanghai, China)

If theres lingering redness, targeted laser treatment can help