Vitamin B12 is typically well-tolerated, but in very rare cases, there are serious side effects to be aware of. Learn more about them here.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." It’s normal to wonder if you’re meeting your nutritional needs if you’re feeling off in your day-to-day.

Vitamin B12 is essential for red blood cells, DNA synthesis and your cognitive health. Taking your vitamin B12 supplement at breakfast time may help with efficacy. While side effects are rare, vitamin ...

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

The world of vitamin B12 supplementation has undergone significant changes in recent years. Once confined to basic tablets, modern B12 supplements now come in various forms designed to meet specific ...

Vitamin B12 is essential to your body, but some people find it hard to maintain healthy levels without the help of a B12 supplement. Not everyone needs to supplement B12, but you should do so if you ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." "Vitamin B12 helps keep our nervous systems and brains functioning properly. It's needed for the ...

From vitamins C and D to calcium and magnesium, it’s critical to know whether you’re taking the correct dosage to avoid health problems ...

Magnesium is a popular supplement for sleep, but doctors say you should avoid combining it with over-the-counter sleep aids.

Medically reviewed by Maggie Moon, MS, RD Vitamin B12 supports red blood cells, nerve health, and DNA production, with adults ...

While taking B12 on an empty stomach is generally safe, some mild side effects may occur. “A few people may have very mild side effects like nausea, stomach upset, bloating or a metallic taste. These ...