This timeline matches B12 pharmacokinetics: intramuscular methylcobalamin reaches peak serum concentration at 8-12 hours, but tissue saturation (particularly in the liver and nervous system) occurs over 48-72 hours as the vitamin is transported into cells and converted to active coenzyme forms (Andrs et al., 2018)
The lack of Vitamin B12 in the diets of vegetarians has challenged researchers to develop veganic and vitamin-enriched dietary resources and supplements
After: Most patients feel more energized within 4872 hours
Has given me lots of energy and Im down 7 pounds
Common side effects include mild injection site reactions (such as pain, redness, or swelling), headache, flushing, dizziness, and nausea
Vitamin B12 deficiency can cause a variety of symptoms, and they can vary depending on the severity and duration of the deficiency