Choosing the right multivitamin for you is an important step to getting the nutrients your body needs. The best-selling US adult and prenatal multivitamin preparations in 2018 contained iodine in a range of concentrations, from as little as 25 mcg to 93% higher than the recommended daily allowance (RDA).

Multivitamins without iodine | Vital Nutrients contributes to normal thyroid function and is required at all life stages. It’s also a key component of energy-yielding metabolism, the normal functioning of the nervous system and skin maintenance.

You should look for a iodine-free multivitamin if you are pregnant, breastfeeding or if you have an autoimmune condition like Grave’s disease that causes hyperthyroidism. This condition can cause anxiety, irritability, rapid heartbeat, difficulty sleeping and weight loss.

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Taking iodine with prescription drugs for blood pressure or hyperthyroidism can also alter the balance of thyroid hormones. This is particularly true for patients receiving treatment for Grave’s disease, which includes radioactive iodine to reduce the overproduction of thyroid hormones.

The right multivitamin has to be free of iodine and contain bioavailable forms of B vitamins, specifically methylated versions. Many Hashimoto’s patients have a genetic variation that makes it difficult for them to create the necessary rate-limiting enzymes and acquire the methyl donors the body requires to fully absorb and use conventional forms of B vitamins.

A good multivitamin contains a high dose of methylated forms of the essential vitamins folic acid, pyridoxal-5-phosphate and cyanocobalamin. These compounds are required for the synthesis of neurotransmitters, including serotonin, and promote healthy neurological development.