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High biotin levels can cause falsely low TSH readings and falsely elevated free T4, mimicking hyperthyroidism on paper

They appear quickly and they resolve quickly

The FDA has specifically flagged risks including dosing errors, variable concentrations, improper storage during shipping, quality control differences, limited adverse-event reporting, and products falsely marketed for research or non-human-use purposes

Vitamin C is an antioxidant that helps protect cells against the harmful effects of free radicals

This pattern suggests that with repeated dosing, nonspecific behavioral effects such as malaise or sedation may diminish, potentially reflecting pharmacodynamic adaptation or increased tolerability