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[21] Oral vitamin B supplements can be bought without a prescription, but the injectable form is regulated and dispensed as a prescription product

Sung and other integrative experts often weigh in on the best delivery methods

Jochberger S, Mayr VD, Luckner G, Wenzel V, Ulmer H, Schmid S, et al

Hypothyroidism : An underproduction of thyroid hormones, which can be caused by Hashimoto's thyroiditis, postpartum thyroiditis, iodine deficiency, thyroid removal, exposure to excessive iodine, or certain medications like lithium

About 15% of patients had injection site reactions, which the companies described as mild and moderate in severity, with redness, irritation or swelling