Sport Whey Protein - Out Of Date

Sport Fitness
I have some protein powder that's out of date but still in sealed packaging, one tub is 4 months and the other 2 months out of date.
I opened the 4 month old one and it smells fine, even had some and it doesn't seem too bad.

What I was curious about is whether the quality of protein degrades over time so what I'm consuming is practically worthless?
 
What conditions has it been kept in?
 
Just in a cupboard, its been pretty hot in the UK for the last week or two but I wouldn't say it was too bad.
A couple of days since I started using it and I still feel OK so it isn't rotten, just wondering about the condition of the proteins
 
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