Blumin Urban's Red Onion Shampoo regulates and stimulates hair growth. Daily use. This shampoo is recommended for devitalized hair with a greasy tendency, due to its high content of sulfur, vitamin C, flavonoids and natural essential oils. The oils in onion shampoo stand out for their high efficiency and their purifying, antiseptic, antioxidant, anti-irritant and growth-stimulating capacity.