It was first isolated from human plasma, where it naturally occurs at concentrations of around 200 ng/mL at age 20, declining to approximately 80 ng/mL by age 60
However, for exceptionally thin or muscular people with little subcutaneous fat, you may need to insert the needle at a 45-degree angle (diagonally) to avoid injecting it into muscle tissue
Make sure your doses still fall above 5 units on the syringe for acceptable accuracy
A B12 shot delivers this important vitamin directly into the muscle for fast absorption, bypassing the digestive system and ensuring your body gets the full benefit
F., Kelishadi, R., & Schulin, R
In an elegant study comparing genetically identical mice housed in different rooms, the authors discovered that one colony had a colonic mucus layer that was impenetrable by bacteria, while the other colony had the opposite