For preventing hair loss and stimulating hair growth, choose products that contain key ingredients such as caffeine, black pepper extract, niacinamide, and zinc, which stimulate hair growth, reduce hair loss, and strengthen the hair. Nettle, birch, sage, and rosemary extracts are known for their growth-stimulating benefits. Yarrow, horsetail, and linden extracts combined with grapefruit oil hydrate, strengthen the hair, and reduce hair loss.