Vitamin B-complex supplements include all of the essential B vitamins in one pill. Some of these supplements contain 100% of the recommended daily allowance (RDA) of every B vitamin. Others ...

Vitamin B complex is a group of eight B vitamins ... When taken in doses over 100 times the RDA, niacin can cause: If taking ...

If you’re taking a B-complex supplement, you’ll get several or all of these B vitamins, often at levels that exceed 100% of your Daily Value. Check the label on your product to see what ...