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Certain NSAIDs (nonsteroidal anti-inflammatory drugs) of the salicylate subclass (specifically, salsalate, diclofenac sodium, and naproxen) These have been found to decrease serum T3 and T4 measurements

Tosato, M., Calvani, R., Picca, A., Ciciarello, F., Galluzzo, V., Coelho-Jnior, H

In Food Safety and Quality in the Global South (pp

[DOI] [PMC free article] [PubMed] [Google Scholar] 9.Santhamoorthy M., Asaithambi P., Ramkumar V., Elangovan N., Perumal I., Kim S.C

The University of Turin review also found that women with fibromyalgia had lower levels of 5-HTP in their bodies, and supplementing with the chemical helped improve symptoms such as pain and fatigue