Aloe vera powder, organic (lyophilized, certified as 100% organic by Ecocert Greenlife according to COSMOS-standard), allantoin powder (purity > 99%, melting point—229 °C), natural BHA salicylic acid (9.8–11.5%, aqueous extract from the bark of the black willow tree) and xanthan gum (raw material), highly pure form (91.0–108.0%) and of high-molecular weight, were purchased from Elemental SRL, Romania, as certified organic products. Deionized water was used as a solvent for hydrogel preparation.
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