Introduction: The Hype vs. the Whole Story Walk through the supplement aisle and you’ll see “high % beta-glucan” labels everywhere. Some even boast 50–60% beta-glucans—numbers that sound impressive at first glance. But here’s the catch: in nature, mushrooms don’t contain beta-glucans at those levels.Such sky-high percentages usually come from isolates—compounds stripped from the mushroom’s natural …
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