People who don’t get enough vitamin B12 through their diets may need a supplement to fill the gap. Here’s how much to take.

B12 shots will benefit only those with a B12 deficiency and people with some underlying conditions. No research indicates that B12 shots will help with weight loss or benefit healthy individuals. B12 ...

This article was reviewed by Lynn Marie Morski, MD, JD. Key Takeaways: There’s not much research on B12 shots for weight loss ...

Vitamin B12 is essential for nerve function and red blood cell production, with daily needs varying by age, pregnancy status, ...

B12 shots work fast but don’t last long. Most leaves your body within a day, though some is stored in the liver. Regular injections may be necessary to maintain steady levels, especially if you have ...

DEAR DR. ROACH: I am 71 years old and was diagnosed with pernicious anemia in October 2024. My B12 and folate levels were low. My antiparietal antibodies were abnormal, but the intrinsic factor ...

Vitamin B12 deficiency can cause anemia, nerve damage, cognitive changes, and mood symptoms. Experts warn it’s often missed, especially in older adults.