What I use for shine is not natural or CG, but right now I am liking Rita Hazan Shine Gloss in Clear. I use it maybe every 8 weeks, but will probably start going to 4-6 weeks. On my 3b curls, my hair texture is smoother, the curl is slightly looser, and it definitely has a healthier shine.

Another product I have waiting in the wings unused is Oscar Blandi At Home Salon Glaze. From their promo blah-blahs on various sites, this one had me at "This clear glaze can be even dropped into your favorite conditioner for a daily dose of shine." Which I haven't done yet, since I wanted to use up the Rita Hazan first, but now I may try this one sooner.
Location: Texas
Type: 3b/3c (i), below shoulder length.
CO wash: A-O GPB LYY, Desert Essence Coconut, Oribe Silverati
Leave-ins: Curl Junkie Beauti-Curls, KCKT, cno overnight
Styling: BRHG, MGA Sculpting Gel, A-O Mandarin Magic Gel, LOTD AVG, LALSG, CJ Pattern Pusha
DT: Curl Junkie Deep Fix, Briogeo Don't Despair Repair!