Advertisement
question

Are there any side effects from Vitamin B?

Stacy Wiegman, PharmD
Stacy Wiegman, PharmD
Pharmacy
answer
Side effects from B vitamins vary depending on which B vitamin you consume. Side effects generally occur only when you consume too much -- and it's very hard to overdose if you get your B vitamins from food. But you can get too much from supplements.

For example, consuming too much vitamin B3 (niacin) may cause skin flushing, rashes, stomach ulcers, or even liver damage. Excess amounts of vitamin B6 may lead to a lack of coordination or numbness. Too much pantothenic acid (vitamin B5) may cause diarrhea. Talk to your doctor if you think you might be experiencing side effects from taking levels of B vitamins that may be too high.
dotFIT
dotFIT
answer
There are side effects to almost any vitamin if you ingest too much, but there are also side effects if you get too little. Side effects from high levels of B-vitamins, well above the RDA are very rare when taken orally. This is due to the fact that they are water soluble, which allows you to excrete excess amounts through urine. The B vitamins include: B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (Pantothenic acid), B6 (pyridoxamine), folic acid (B9) and cobalamin (B12). Validated adverse reactions to B vitamins are generally confined to vitamins B3 (niacin), B6 and injections of B1 (thiamine), although rare. These side effects can range from drops in blood pressure, disruption in nerve transmissions to rashes and skin flushing. In order to avoid side effects of B vitamins, make sure you stay within established safe/necessary ranges (see below) -- especially when taking vitamins B3 and B6. The goal is to make sure you get proper daily amounts of the necessary B vitamins unless advised otherwise by a qualified physician. This goal is accomplished by taking a daily multivitamin and mineral formula that contains the necessary B vitamins shown below.
  • B1: 2-30 mg/day
  • B2: 5-30 mg/day
  • B3 (Niacinamide): 30-50 mg/day
  • B6: 6-50 mg/day
  • Folic acid: 400-900 mcg/day
  • B12: 6-50 mcg/day

Continue Learning about Vitamins

3 Must-Have Vitamins for Great Skin
3 Must-Have Vitamins for Great Skin
Sometimes your skin likes it better when you slather on your vitamins rather than swallow them. To give your skin a youthful glow, experts recommend ...
Read More
What vitamins can I take if I'm using statin drugs?
What vitamins can I take if I'm using statin drugs? You need to be careful what you take with statin...
More Answers
How are water-soluble vitamins absorbed by the body?
How are water-soluble vitamins absorbed by the body? They are absorbed directly into the bloodstream...
More Answers
Can I crush vitamin supplements before swallowing?
Can I crush vitamin supplements before swallowing? Check with your pharmacist or doctor before crush...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.