zarbee's naturals children's sleep liquid with melatonin (pack of 4) zarbee's dr. zak zarbock, a pediatrician and father, couldn't find effective chemical-free products to keep the whole family healthy, so he created his own products including handpicked natural ingredients, whenever possible. the result is zarbee's naturals. our sleep with melatonin supplement is a safe and drug-free product to help promote peaceful sleep*. *these statements have not been evaluated by the food and drug administration. this product is not intended to diagnose, treat, cure, or prevent any disease.