Customers prevagen reviews typically don't go to well, despite what the marketing and their own funded studies would have you believe. It actually managed to screw up it's own trial and the FTC went after them as a result . It actually proved that it was no more effective than a placebo at improving memory or cognitive function. That's just not what they said. Somehow Prevagen is still on the market and being sold in stores, although we really don't know how that's a thing.
They've been sued for false advertising  and if that wasn't nearly bad enough, there's a good chance that their "unique" ingredient could actually be dangerous.  Commonly reported side effects included everything from dizziness and nausea, through to cardiovascular issues and ironically memory problems.
The supplements do contain vitamin D which could actually have some mild improvements towards brain function, but in general Prevagen has been an unmitigated disaster that should be avoided at all costs.
That's not to say all hope is lost, nootropics that actually work do exist, just they typically contain ingredients like Citicoline or Phosphatidylserine. We have a list of nootropic supplements that actually do have some scientific backing here .
Well, some laws may be changed to add some oversight to the supplement industry when they're making false claims about a dietary supplement. So, technically that's a good thing, but we can't say that the pills themselves are. As we've mentioned Vitamin D can help with mood and has other benefits and that can help with brain fog , but if you're only getting the vitamin D boost to improve cognitive function, then well you can get a vitamin D pill for an awful lot cheaper than prevagen without the side effects.
The legitimate customers prevagen reviews we found as you'd suspect have been nothing short of an unmitigated disaster for the company. Many complaining of side effects and oh so shockingly, with a study population that showed no statistically significant improvement, this comes as a total surprise. As dietary supplements go, this one is poor. Of course the reviews were bad. There's a lot of blatently fake reviews on Amazon, but it's not surprising that a company with a budget like Prevagen would invest in this.
We answer some of the most commonly asked questions about Prevagen.
No, in fact the FDA is concerned that they've been underreporting issues that people have been having when taking the supplement.
As far as we are concerned yes, Prevagen is a scam. Aside from being a vitamin D3 pill there really isn't an answer to why anyone would recommend it unless they were being paid to sell it. We review a lot of over the counter suppplements, and prevagen is definitely a contender for the very worst supplement that we've had the misfortune to come across.
Vitamin D3 is all well and good, we don't really have any complaints here, most americans are deficient and supplementing for vitamin D can improve memory and brain health.
Apoaequorin is where the problems come in. Apoaequorin is a calcium binding protein found in luminescent jellyfish, the thought process behind using it as a supplement for brain health is that calcification in the brain is related to declining cognitive function. Especially large build ups of calcium stones. The compound is very similar to the naturally occurring human protein calmodulin, which does the same thing and is believed to have further impact on memory.
Unfortunately for this dietary supplement it seems that apoaequorin is taken orally it can not cross the blood brain barrier and thus never actually makes it to the human brain, it's simply broken down in the stomach. 
Worse still, even taken in small doses, lower than 10mg/day it can cause problems notable side effects. The so called "clinically proven" ingredient really has no scientific backing whatsoever to support Prevagen's claims.
Whilst, they claim that they never intended Prevagen to be used to people struggling with severe memory issues from conditions like alzheimer's disease, they heavily implied that Apoaequorin would make a notable difference. Of course it dosn't. Taking prevagen won't help clearer thinking or word recall as they claimed and it's more likely to harm you than do anything to aid with healthy brain function.
Don't buy Prevagen, for the good of your own health and wallet. We have absolutely nothing good to say about this supplement. Products like Prevagen and their false claims do nothing but harm the entire health sector. It's been such an issue that there are now calls for further regulation on the industry. Although we can see the appeal after all of the issues. As a rule of thumb, the europeans have more regulations on what supplements manufacturers can claim to be clinically proven, or actually aid brain health. So if the product isn't on sale there, then there's definitely more risk of buying a dud.
Either way please don't buy prevagen. If you want something that can actually improve memory, check out our list of safe nootropics.
1 - https://www.ftc.gov/news-events/news/press-releases/2017/01/ftc-new-york-state-charge-marketers-prevagen-making-deceptive-memory-cognitive-improvement-claims
2 - https://www.reuters.com/article/quincybioscience-ftc-memorypills-idUSL1N1EZ13E
3 - https://www.wired.com/story/prevagen-made-millions-fda-questioned-safety/
4 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6132681/
5 - https://www.ncbi.nlm.nih.gov/books/NBK552157/