b complex and b12 injection Phoenix Vitamin Injection, 100 mL at Tractor Supply Co B-Complex Injection – Wellness at
Description
From here, the vitamin enters nearby blood vessels without relying on digestion

If you have some of those symptoms especially if you have a low red blood cell count you should talk to your doctor about further blood tests for vitamin B12

Genetic proof-of-concept Kraus et al

[PubMed: 2944781] 24
We know life gets hectic, which is why our treatments are designed to fit right into your schedule