Your tongue may look very smooth, have red patches, and be swollen
August 7, 2025 6:42 View More Why Synthroid Isnt Working The Shocking Truth About T4, T3 & Thyroid Symptoms with McCall McPherson In this episode of Modern Thyroid Wellness, McCall McPherson unpacks one of the most common frustrations in thyroid care: why levothyroxine-based medications (like Synthroid) often leave patients feeling unwell, even when their labs look normal. Drawing from her own experience as a thyroid patient and her extensive clinical work, McCall explains the flawed assumption that every body seamlessly converts T4 into active T3and why thats simply not the case for many people
It's become a popular ingredient in pre-workout supplements due to its ability to boost nitric oxide levels [1]
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Topical application (well-studied): Serums at 0.1-0.5%, creams at 0.2-1%, hair products at 0.1-0.3%
[DOI] [PubMed] [Google Scholar] 77.Jumpertz von Schwartzenberg R, et al