I have used "Unjury" who make medical quality protein. They mix well, tastes good with several flavored, unflavored, and even have a chicken flavored protein stock base. I stay away from high protein bodybuilding drinks with too much protein, and who know what they put in them. I also used K-PAX, protein blend, immune booster, which is 100% rice protein, made for medical conditions like cancer, others as well.

To increase calories, you can add any healthy vegetable oil to anything, since each Tbs has 120 calories, 14g of fat.

Too much protein can cause a hardship on the organs, especially the kidneys, which can cause dehydration, due to the need to eliminate ketones in the urine. It's adequate protein, what that is differs for everyone based on height, weight, activity level, and medical conditions, and who you talk with. Check with your healthcare team before adding any supplement.

Good luck.