Has the protein powder bubble been punctured? On Oct. 14, Consumer Reports published an investigation into the heavy metal levels of 23 popular protein powders and ready-to-drink shakes, reporting that many of them contain concerningly high levels of heavy metals like lead, cadmium, and arsenic.

Of the brands that were evaluated, two contained enough lead that the experts CR consulted advised against ever consuming them: Naked Nutrition’s Vegan Mass Gainer and Huel’s Black Edition. Per the report, the former contained 7.7 micrograms of lead per serving, or roughly 1,570 percent of CR’s “level of concern” for the heavy metal. And the latter contained 6.3 micrograms of lead per serving, or about 1,290 percent of CR’s determined daily lead limit.

Both brands have since defended their products. Naked Nutrition said that after reviewing the available information and verifying results through independent third-party testing, it “confirmed that no heavy metals exceeded FDA reference intake levels for adults.” Meanwhile, Huel claims its data “tells a very different story from the one presented in that article,” and that all of the company’s products “are independently tested, and the results consistently show that the naturally occurring minerals found in our formulas are well within globally recognised food safety standards.”

Nevertheless, the CR revelations sent shockwaves into the ever-growing ranks of proteinmaxxers. Especially those who happen to have consumed quite a bit of the aforementioned protein brands. We got on the phone with Huel customer Adam Cross on Thursday, minutes after he got out of a blood test for lead and a urine test for a spectrum of heavy metals.

Cross caught wind of the report’s findings not long after it was published. “I did hear about it, oh man, maybe two days ago or so,” says the 36-year-old Philadelphia resident. “I didn’t really think too much about it, but suddenly somebody had posted a picture of Huel’s lead content and I was like, ‘I eat that every single day, sometimes twice a day.’ So, that kind of got me worried.”

Cross discovered Huel through his hobby of powerlifting. To gain muscle, he was aiming to eat between 3,000 and 4,000 calories a day—no easy task. Huel offered a solution. He’d eat it raw, put it in a morning smoothie, or add it to a mix of yogurt and granola.