Not all protein powder sources are the same. Some are soy, some are bone broth, some are whey isolates. Big difference between all of them. WRT the insulting of gym-bros and brain damage above, most I know of go for the whey isolates or other animal sourced, not vegan. Note to the vegans (from the article):
"The lead levels in plant-based products were, on average, nine times the amount found in those made with dairy proteins like whey, and twice as great as beef-based ones. Dairy-based protein powders and shakes generally had the lowest amounts of lead, but half of the products we tested still had high enough levels of contamination that CR’s experts advise against daily use."
If half of the products still had "high enough levels of contamination that CR’s experts advise against daily use.", were those half all vegan sourced? After reading the article further, it looks like if you're rolling the dice, go with whey isolate only and totally skip the vegan protein powders. The one I use 4 days/week isn't listed, but it is a whey isolate (Natural Factors)