Lochina, fine hair generally does very well with protein. I have fine, normal-low porosity hair that is 97% virgin (except for 4 skinny highlights that are growing out) and my hair loves protein. It is not damaged, but it is fine.

I do the plain gelatin treatment (no extra additives), which is cheap and easy to make. I try to do it weekly but I don't always have the time. My other products have protein in them as well. Lately I've been using Shescentit Okra Hair Repair Reconstructor + CNPF as my RO. I look for leave-ins with protein as well.
fine - low/normal porosity - medium density - normal elasticity.

Currently using:
Cowash: Cure Care diluted with water 1:1
RO: Cure Care, V05 Kiwi Lime
Styler: UFD CM (old formula), FSG + CNPF
PT: IAgirl's gelatine

Experimenting with: no guar hydroxypropyltrimonium chloride, gelatin gel

Recent findings: my hair likes Cure Care diluted with water as a cowash; does NOT like guar h.c.!

iherb discount code: CFN646