To use this shampoo, wet your hair thoroughly first. Then, apply a small amount of the shampoo to your scalp and hair, gently massaging it in for a couple of minutes. Rinse it out completely with warm water. You can use it as often as you need, especially after swimming. As for storage, keep it in a cool, dry place away from direct sunlight. There are no major side - effects, but if you have extremely sensitive skin, it's a good idea to do a patch test first. Remember, for the best results, pair it with the Premax Deep Conditioner.