Guanadine carbonate is the active ingredient in many drugstore relaxers including Motions, ORS no-lye, dark n lovely, etc. Guanadine carbonate isn't lime water, it's an extract from sea gull crap (well that's the source I know about). Calcium hydroxide is the lime water base used by typical no-lye relaxers. Phyto doesn't use calcium hydroxide as a base - they use a conditioning base with 50-11 ingredients however mineral oil, propylene glycol and lanolin are prolly the key hair softeners. And note that box relaxers add conditioning ingredients to their base as well and you can also add more on your own.
From the sephora website ...
PS642 Straightening Balm:
Water / Aqua, Mineral Oil / Paraffinum Liquidum, Emulsifying Wax Nf, Propylene Glycol, Egg Extract / Ovum (Extrait D'œuf), Steareth-100, Peg-75 Lanolin, Disodium Cocoamphodiacetate, Oleth -20, Cetearyl Alcohol, Peg-10 Rapeseed Sterol, Hydrolyzed Soy Protein (Soja), Fragrance / Parfum, Egg Oil / Ovum (Huile D'œuf).
PS653 Inductor Index 2:
Water / Aqua, Guanidine Carbonate, Xanthan Gum, Propylene Glycol, Yellow 5 / Ci 19140, Red 4 / Ci 14700.
PS645 Milky Restructurer:
Althaea Officinalis Root Extract, Cetearyl Alcohol (Dérivé D'huile De Coco), Propylene Glycol, Dicetyldimonium Chloride, Distearyldimonium Chloride (Dérivé De Colza), Mineral Oil / Paraffinum Liquidum, Water / Aqua, Guar Hydroxypropyltrimonium Chloride (Dérivé De Gomme Guar), Stearic Acid, Ceteareth-33 (Dérivé D'huile De Coco), Hydroxypropyltrimonium Hydrolyzed Wheat Protein (Dérivé De Protéines De Blé) Amodimethicone, Acetamidoethyl Pg-Trimonium Chloride, Canola Oil, Fragrance / Parfum, Lanolin Alcohol, Oleyl Alcohol, Isolaureth-6, Octoxynol-40, Sodium Chloride, Phenoxyethanol, Methylchloroisothiazolinone, Methylisothiazolinone, Yellow 5 / Ci 19140.
The active ingredients in any relaxer are natural. Sodium hydroxide comes from ashes. Just coz something is natural doesn't mean it can't alter aspects of your physiology.