Dietary supplements containing all eight are referred to as a vitamin B complex.Because water-soluble B vitamins are eliminated in the urine, taking large doses of most B vitamins usually only produces transient side effects (with the only exception being pyridoxine).
B-complex vitamins and vitamin C are water-soluble vitamins that are not stored in the body and must be consumed each day. These vitamins can be easily destroyed or washed out during food storage and preparation.

Moving forward, it's essential to keep these visual contexts in mind when discussing Complex Vitamins Usually Contain Lower Doses.
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 contain higher doses of some or all of these vitamins.

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Iron-containing multivitamins can be extremely toxic in children and adults when large doses are consumed. Prenatal vitamins usually contain higher amounts of iron than a regular adult or childrens multivitamin and can be especially dangerous.
Vitamin B-12 supplements also are suggested for women who are pregnant, who are breastfeeding and not using any formula, or who follow vegetarian or vegan diets. Taking high doses of vitamin B-12 can cause side effects.