Grande Cosmetics GrandeBROW-FILL Volumizing Brow Gel, Clear

I have medium to dark brown hair. Is the light or dark better? I’m afraid the dark may be too dark. I also have olive skin tone.

does it have a true taupe color for blondes?

What color does light mean? I have dark brown hair and a fair complexion. Would I use light or dark?

Description is unclear. Does this contain a growth serum or is it just cosmetic.