“NSF Certified for Sport also indicates this supplement has undergone label claim testing (so the label is accurate) and contaminant testing for heavy metals, microbes, and pesticides,” says Clear. “This may be the most pure option on this list,” she adds.
While Gnarly earned a perfect third-party testing rating, it didn’t live up to our standards for solubility, leading to a disappointing score of 3 out of 5 stars.
“It doesn’t mix very well and settles quite a bit,” our product tester noted. “I usually end up stirring it several times while I take it.”Many Amazon reviews echo similar sentiments, so if you’re searching for a smooth sipping experience, consider an alternative like Sports Research.
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