I believe the V05 has Hydrolyzed Keratin and that is protein. V05 also has chlorides and, personally, some of those destroy my hair.

The Nature's Gate has even more protein. Hordeum Distichon (Barley) Extract, Wheat Amino Acids, Soy Amino Acids. And if I remember correctly, panthenol and cellulose behave like proteins *I think*.

Protein overload is typically dry, brittle, and "straw-like."

Good luck.
remember, with all advice or suggestions for your hair, YMMV!!
My hair:
2b wavy, medium texture, low porosity, med-high density. Protein finicky.
My routine:
Cleansing: DCNP, every 4-5 days (occasionally use CJ cleansers).
RO: CJSC, occasionally use JCDC
Gel: KCCC, CJCIAB for 2nd day hair (sometimes third)

Heat is my friend: warm water rinses, steam caps, and diffuse dry. I love CLU cloths and my Denman.