Check ingredients. If it has anything other than milk protein isolate listed as thr main ingredients or mention soy before listing at least five ingredients, its worthless.

Next, check the protein availability. 70% protein is fine but anything below is low-quality. 80% is better. Above 90% is too expensive. (Check how many grams/pounds of protein it has and divide by the sample size. 21g protein per 30g measure is 70% protein.

Then finally check flavor. Not all flavors work well with you. Also take casein or albumin before sleeping. Follow same protocol, take same amount.