I'd never recommend a PCT not based around a SERM.
That being said, HCGenerate and DAA are solid natural testosterone boosting products to use in PCT (I'd still recommend they be used in conjunction with a SERM).
HCGenerate + Power Chews D-Test would actually pretty stellar (DAA + LCLT in one product). Toss in some Erase or Forma and it'd be even better (still not as good as just adding a SERM in there, though lol).