What heavy metal testing limits apply to functional mushroom gummies?

Mushrooms are natural bioaccumulators, meaning they absorb whatever is present in the growing substrate, including heavy metals. Reputable mushroom gummies undergo testing against California Proposition 65 limits or similar standards covering lead, cadmium, arsenic, and mercury. Verifying that the brand publishes recent test results is a basic quality-control step when purchasing mushroom gummies.

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