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Lower levels of vitamin A 20 can adversely impact the thyroid gland and lead to higher TSH
Products should be evaluated based on ingredient quality and dosing, third-party testing and manufacturing standards, company transparency about pricing and terms, realistic marketing claims that acknowledge evidence limitations, and clear return policies and customer support access
doi:10.5665/sleep.1580 Chapman JL, Vakulin A, Hedner J, Yee BJ, Marshall NS
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