Are Cheap Vitamins as Potent as Expensive Ones?

Any brand of a single vitamin, such as vitamin C. is usually fine. but the potency varies among brands of multivitamins. Some less expensive brands, such as Wal-Mart's Spring Valley, are well-made, but some supermarket and drugstore brands may not be as reliable.

Name brands that are made by divisions of major pharmaceutical companies usually deliver what they claim.

Examples: Centrum and One-A-Day.