"How Protein Conquered America"

Eater:

the health outcomes of consuming protein supplements are downright murky. Since both are sold as supplements, the FDA only requires that they be safe for consumption, and the FDA does none of its own testing — rather, it collects self-reported lab results and waits for something to go wrong. In July 2010, Consumer Reports found significant amounts of heavy metals, including arsenic and mercury, in certain protein products. Three servings of EAS Myoplex Rich Dark Chocolate ready-to-drink shakes together contained more than the recommended limit of arsenic by the US Pharmacopeia. Three servings of Muscle Milk Chocolate powder had more than the recommended amount of lead, and nearly as much arsenic. The FDA never challenged the company on this, but Cytosport did settle a $20 million class action lawsuit on the claims two years later.

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The Muscle Milk brand also seems to have lowered its testosterone across the board, going from fat, thick block type to a taller, leaner, more even font. The company used to rely on male spokespeople for major campaigns, but starting in 2017, three different national campaigns aimed at women featured female athletes.