If you are looking to buy nootropics in the UK, then I can vouch for intellmeds and https://rawpowders.co.uk/ – at least I’ve never had any issues. Intellmeds is a ball ache to send payments to, but their products are excellent.
Disclaimer – Always talk to your GP before taking supplements
My favourite Stacks include:
Beginner’s Focus Stack
Choline (citicholine is best but PQQ also good)
ALCAR (upsets my stomach first thing in the morning though)
I also like hordenine and a tiny amount of PEA – Phenylethylamine.
PEA shouldn’t be used every day. I can only use a tiny amount without it giving me a migraine though, so I think my 4 day a week habit is okay. Take Hordenine about 20 minutes prior to PEA.
In fact, just avoid Phenylethylamine if you have any level of an addictive personality. Having said that – if I remember rightly, Dr Andrew Huberman has mentioned it as a valid treatment for depression a couple of times on his podcast.
You can buy everything including PEA from Amazon or eBay.
If you do a sport – from MMA to table tennis, these nootropics can also help improve performance. I find ALCAR (acetyl L carntine) particularly helpful. Just watch out if you have a sensitive stomach.