Here's the thing - even if you find the name of this remedy, you can only really verify whether it works if you yourself notice your memory improving over a month or two. And that's super subjective. Someone might just be in a better mood, sleeping better, or dealing with less stress, and it feels like their memory got better. But in reality, it might have nothing to do with the pill at all.
The main thing worth paying attention to is who conducted the study and who funded it. If it was the company that sells the drug, the results often look better than they actually are. Independent studies are a whole different story - they're usually more honest. And definitely check whether they did trials on a large number of people over a long period of time, not just a handful of volunteers over a few weeks.
If it's something like vitamins, berries, or herbal blends - you should be pretty skeptical about them being a "cure for forgetfulness." For memory as you age, a healthy sleep schedule, physical activity, and keeping your mind active actually help way more - that's way more proven than any miracle remedy.