I am pretty sure it was the first soap ever made. Originally it was a pure soap just with olive oil, laurel oil and lye. No fragrance or additives. It is apparently still classified as a Castile soap. It is low allergenic and very mild on the skin when cured for a long time.
Good for eczema sufferers etc.
Wiki says:
Laurel oil is an effective cleanser, antibiotic, anti-fungal and anti-itching agent. Compounds extracted from Laurus Nobilis have recently been identified as an inhibitor of human melanoma (skin cancer) cell proliferation, as well as inhibiting other human tumor cell growths such as amelanotic melanoma, renal cell adenocarcinoma, and breast cancer cell lines.
Olive oil has been known for generations not only for its healing qualities but also as a natural, deep penetration moisturizer, regenerating skin cells and softening the tissue.
Unlike most soaps, Aleppo soap will float in water!