Natural is not necessarily better: there are plenty of irritants, allergens and toxins in nature and many natural products have piles of plant extracts added. You might be best going for something really neutral with very few ingredients, perhaps something sold as a conditioner base, intended to have oils or fragrances added or sold as hypo allergenic or something based on aloe vera inner leaf gel (healing, anti inflammatory).
Inecto has few ingredients, no parabens, is light and cheap.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics