Hi Gladioli66, Buhner recommends Liquid melatonin by Premier Research Labs as his favorite. That is the one he uses. I have not personally tried it yet but i have heard it's really good. It is the one i plan on using and is in my cart as we speak.
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There are quite a few places you can purchase it from other then their personal website if you have other herbs/ supplements you need to purchase. Some with free shipping. There are also some websites with sales going on because of the holiday weekend.