If you have a temporary deficiency or increased requirement (say, after a surgery or during recovery from an acute illness), you might only need a short course, perhaps a few weeks of injections, until your vitamin levels normalize or you can meet your needs by mouth again
A lack of vitamin B12 doesnt directly lead to weight gain, however, so getting a B12 injection alone wont cause you to lose weight no matter how many times your doctor calls the injection a skinny shot
Circulating levels decline with age, from roughly 200 ng/mL at age 20 to about 80 ng/mL by 60. Small split-face human dermatology studies, usually with fewer than 50 participants per arm, report changes in wrinkle depth and skin density
High dose vitamin C (over 5 grams and up to 50 grams) can be incredibly therapeutic, but it is not for people with kidney disease or people with G6PD deficiencies
Avoid injecting yourself in the knobby, top part of this muscle