how long before vitamin b12 injection takes effect Fast Does a Shot Work? B12 Shots Side Effects And

Those of you familiar with B12 injections will note this is uncharacteristic of vitamin B12 alone

Got D3 and B12 shots and hoping that gives me energy

It does

The most common thing you might notice is mild redness, tenderness, or slight swelling where the needle went in, and that usually settles quickly

Neelakantan H, Vance V, Wetzel MD, Wang HY, McHardy SF, Finnerty CC, Hommel JD, Watowich SJ. Selective and membrane-permeable small molecule inhibitors of nicotinamide N-methyltransferase reverse high-fat diet-induced obesity in mice. Biochem Pharmacol. 2018 Jul;154:161-171. doi: 10.1016/j.bcp.2018.05.003. Epub 2018 May 5. PMID: 29738706; PMCID: PMC6015571