[header] How to buy the best supplements [title] Ask your doctor if the supplement will help with your condition. [step] Meet with your doctor to get some professional advice on whether or not a supplement will benefit you. Your doctor can perform a physical exam as well as simple blood tests to determine if you have any vitamin deficiencies or if you have any other conditions that may require supplementation. 
Then, your doctor can recommend a supplement and dosage that is appropriate for you. [substeps] Make sure that you talk to your doctor about why you want to take supplements.