What are Myadec (Multivitamins)?

From the Guidelines

Myadec is a brand of multivitamin supplements that contains a combination of essential vitamins and minerals designed to support overall health and well-being. These multivitamins typically include vitamins A, B-complex (B1, B2, B3, B5, B6, B12), C, D, and E, along with minerals such as zinc, selenium, copper, and manganese. Myadec multivitamins are formulated to help fill nutritional gaps that may exist in a person's diet, supporting immune function, energy production, and cellular health. They are generally taken once daily with food to maximize absorption. While multivitamins like Myadec can be beneficial for individuals who have difficulty meeting their nutritional needs through diet alone, they should not replace a balanced diet but rather supplement it. People with specific health conditions, pregnant women, or those taking medications should consult with a healthcare provider before starting any multivitamin regimen, as certain components may interact with medications or be contraindicated in some conditions 1.

Key Considerations

• The USPSTF concludes that the evidence is insufficient to determine the balance of benefits and harms of supplementation with multivitamins for the prevention of cardiovascular disease or cancer 1.
• The USPSTF found inadequate evidence on the benefits of supplementation with individual vitamins or minerals or functional pairs in healthy populations without known nutritional deficiencies to reduce the risk for cardiovascular disease or cancer 1.
• The USPSTF found adequate evidence that supplementation with β-carotene or vitamin E in healthy populations without known nutritional deficiencies does not reduce the risk for cardiovascular disease or cancer 1.
• Important harms have been shown with β-carotene in persons who smoke tobacco or have an occupational exposure to asbestos 1.
• The USPSTF did not address doses higher than the tolerable upper intake level, as determined by the U.S. Food and Nutrition Board 1.
• The U.S. Pharmacopeia has developed reference standards to aid in quality control of dietary supplement production 1.
• The USPSTF has a large portfolio of recommendations for prevention of cardiovascular disease and cancer, including recommendations for smoking cessation; screening for lipid disorders, hypertension, diabetes, and cancer; obesity screening and counseling; and aspirin use 1.

Recommendations

• People with specific health conditions, pregnant women, or those taking medications should consult with a healthcare provider before starting any multivitamin regimen.
• Multivitamins like Myadec can be beneficial for individuals who have difficulty meeting their nutritional needs through diet alone.
• A balanced diet should not be replaced by multivitamins, but rather supplemented by them.

From the Research

Definition and Composition of Multivitamins

• Multivitamins and multiminerals have no standard scientific, regulatory, or marketplace definitions 2
• The term "multivitamins-multiminerals" refers to products with widely varied compositions and characteristics
• Multivitamin-multimineral composition databases use label values as surrogates for analyzed values, but actual vitamin and mineral amounts often deviate from label values

Usage and Benefits of Multivitamins

• 52% of surveyed US adults reported using at least one dietary supplement in the prior 30 days, and 31% reported using a multivitamin-mineral supplement 3
• The most commonly cited reason for using supplements is for overall health and wellness and to fill nutrient gaps in the diet
• There is no consistent evidence to support the routine supplementation of oral multivitamins and multi/minerals for cardiovascular disease prevention or treatment 4

Safety and Efficacy of Multivitamins

• The evidence is insufficient to determine the balance of benefits and harms of supplementation with multivitamins for the prevention of cardiovascular disease or cancer 3
• Multivitamin/mineral supplement use may prevent cancer in individuals with poor or suboptimal nutritional status, but there is no benefit for preventing cardiovascular disease or cataract 5
• Certain single nutrient supplements, such as folic acid, vitamin B6, and vitamin B12, may have benefits for reducing stroke risk, but others, such as beta-carotene and vitamin E, may have harms 3, 5