vit b12 injection trade name vitamin brand 100mcg Cyanocobalamin Vitamin B12 Injection at ₹ 60/piece Hydroxocobalamin - Wikipedia
Description
Ive experienced the same
The trapezius (shoulder) and splenius capitis (back of neck) muscles were in severe contraction, which you can see in the top row with the upper right outlining the contraction areas

B12 injections are administered intramuscularly, typically in the upper arm or thigh
This method bypasses the digestive system, ensuring optimal absorption and quicker delivery of essential nutrients to the cells throughout the body

Missing one dose reduces cumulative NNMT inhibition slightly but doesn't require compensation