Welcome to Ask the Doctor. Thanks for your query.
1. You can take whey protein after your gym, though you are diabetic. This will not harm you in any way.
2. But there are certain things which I wanted to share with you.
3. Whey protein is not used if you have any form of kidney or liver disorders.
4. While using whey protein, make sure that you have plenty of water approximately 3-4 liters per day.
Hope this answers your query.
Wish you good health.
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