A single 1.8 g dose of Lion's mane made healthy young adults faster on the Stroop task within an hour, and the result was statistically significant. But the same pilot study found only a borderline stress trend after 28 days (p = 0.051), plus null and slightly negative results elsewhere. With just 41 participants, the authors urge caution. Here is what Lion's mane actually did, how it compares to older-adult research, and how to approach it realistically.
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