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Kenneth McCall, published a paper in 2025 finding that compounded GLP-1s were linked to higher rates of adverse effects than non-compounded products between 2018 and 2024, including more abdominal pain, diarrhea, and nausea

However, avoid using this ingredient if you have a sensitive scalp

The test involves incubating product samples in growth media (typically Fluid Thioglycollate Medium for bacteria and Soybean-Casein Digest Medium for fungi) for a minimum of 14 days and observing for microbial growth

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