Our product is a plant extract, the formula is relatively mild. It had been tested for many times before we put on sale, if you worry about the allergies that you could do an allergy test first.
Both hair and nails contain Hairy scale, the composition of them are similar, so both of them will be colored. When using it, be sure to wear gloves. If the cream accidentally gets on your skin, please wipe it with vinegar immediately.
The product only will blacken hair, instead of scalp. Before use, you can use petroleum jelly or oil. Apply the cream to your forehead and ears, so you can achieve better protection!