I keep reading about how most brands of protein powder use “low quality” protein sources while Biotest uses strictly “high quality” protein sources.
Now it makes sense that whey and caesin are two different things and if extracting/processing caesin is much more difficult, it makes sense that products with caesin are “better.” However, while I would assume whey is whey, that’s apparently not the case.
So, what’s the difference between a high and a low quality protein source with respect to protein powders?