1 ml vitamin b12 injection for Cyanocobalamin 1,000 mcg, 25/Box (Rx) — Mountainside Medical It is used to prevent and to treat vitamin B12 deficiency Vitamin B-12 1000 mcg/ml, 250

If your body does not have sufficient B12, then it cannot make energy and so therefore you are weak, tired, or unfocused

The reasoning is that oral bioavailability is ~4050%, and animal study HED conversions suggest higher doses may be needed for the full effect

I think it's good to carry on breast feeding

Additionally, Nampt knockout mice models demonstrated that NAD + depletion in muscle leads to progressive loss of muscle function, while NR treatment restored mitochondrial function and induced muscle remodeling and restoration 255

Both methods bypass the digestive system, providing superior absorption compared to oral supplements

Tirzepatide drops and tablet formulations may eventually provide needle-free alternatives, though subcutaneous injection remains the standard with the most clinical data behind it