Side effects are uncommon but may include slight redness or soreness at the injection site
[7] [4] Folate levels should be checked before or alongside B12 treatment
However, there are certain conditions in which vitamin B12 cannot be absorbed, for example, due to dietary insufficiency, malabsorption, or lack of intrinsic factor, hepatic stores are depleted, and deficiency ensues
Placebo effects, expectation bias, and individual variability all confound interpretation
Improved Mood and Mental Clarity: Supports neurotransmitter function
See more detailed instructions for administering subcutaneous injections