Can drinking spoiled whey protein powder mixed with water really make you physically ill?

Whey is a dairy by-product, the liquid from cheese making. So yes, essentially, you drank bad milk.

It would depend on exactly what organism was growing in it. Many different microbes can use dairy products as a culture medium, some innocuous (e.g. Lactobacillus acidophilus, which turns milk into yoghurt), some nasty (e.g. Bacillus cereus, Listeria monocytogenes, Yersinia enterocolitica, Salmonella spp., Escherichia coli, Campylobacter jejuni).

If you can, you should probably make yourself hoik it up.

lurve for using the word “hoik”

“thank you, baby. thank you very much”