I purchased a 6 month supply but one…
I purchased a 6 month supply but one bottle came broken. It took 2 weeks to arrive but the 60 money back refund starts on the order date (dumb). They promised to ship a replacement bottle but never did. After the 60 days was almost up, I asked for the refund but they offered to extend the warranty period another 30 days, so I accepted. At almost 90 days, still no change so I again asked for refund but I would need to return the unused at my expense (not cheap). They said they would give me a 50% refund if I kept it, I said no but I would accept a 75% discount. They agreed. Just to prove my point I continued to take it for 5 months (1 broken bottle, remember). I can categorically say, it doesn't work and they obviously make a huge profit to be able to discount it so much.
NOTE: I bought from Cortexi direct at a higher price than is charged on Amazon. Everyone says that the Amazon version taste horrible. Mine was quite a peasant sweet taste so the Amazon version is probably different, but still useless junk.
Conclusion: It is useless garbage and a scam.