Just a warning -St. John's Wort is an herbal medication. Please do not start it without consulting a physician or pharmacist. Also, as with most herbal medications and natural suppliments, there is not a requirement in most countries to prove any benefits. I find that it is always better to look for a Drug Identification Number (DIN) on these products. This tells you that the product has the stringent testing required for medications. Some products will have a Natural Product Number (NPN) instead.