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The only study is a randomized clinical trial with many limitations and biases because 3 patients suddenly experienced adverse effects, and 1 patient experienced pulmonary infection and left the clinical trial

However, their products may still contain ingredients such as essential oils that are considered a fragrance by INCI standards

This matters if the goal is fat loss without losing muscle

J Agric Food Chem 66:11911196 Pan H-Y, Ye Z-W, Zheng Q-W, Yun F, Tu M-Z, Hong W-G, Chen B-X, Guo L-Q, Lin J-F (2022) Ergothioneine exhibits longevity-extension effect in Drosophila melanogaster via regulation of cholinergic neurotransmission, tyrosine metabolism, and fatty acid oxidation