The leaves and bark of the Australian melaleuca tree produce tea tree oil, which is a powerful anti-bacterial, anti-fungal topical treatment. If you suffer with dandruff, head lice or a dry scalp, add drops of tea tree oil to shampoo to improve or eliminate your symptoms.
Use an unopened bottle of shampoo so you know how much you have in the bottle. If you use an opened bottle, use a glass measuring cup to gauge the remnant.
Mix 10 drops of tea tree oil to every 8 ounces of shampoo. If you have 16 ounces of shampoo, add 20 drops of tea tree oil. If you have 4 ounces of shampoo, add 5 drops of tea tree oil.
Pour the mixture back into the shampoo bottle.
Shake the shampoo bottle contents vigorously to distribute the tea tree oil evenly.