Assuming it is L- tryptophan.
Many of the oldschool Bluelighter's will know I've always been a fan of L-tryptophan over 5-HTP. Up until recently, I've usually had a (scripted) supply in the cupboard. However, I got quite a shock when I went to renew my supply a few weeks ago.
I'd changed doctors since my last prescription, which I must admit was over 2 years ago. Since that period, I have seen others get scripts, and had them filled at pharmacists who always supplied 500mg tablets made by Natures Own.
What had changed, was that Natures Own no longer make L-tryptophan. The pharmacist rang around her suppliers and came back to me saying a local pharm producer was willing to make either 100mg or 250mg tablets.
That in itself is a bit of a pain as I hate rattling from taking too many tablets. If you're intending to pre-post load, or just have use for them as a panacea for one of the many conditions they seem to treat, it usually means you want to take between 1-2 grams. I thought about it a moment before asking the price. I was quoted ~ $***-00 for 60 x 250mg tabs, which, weight for weight of L-tryp, is twice the price Natures Own sold for. I turned it down, deciding if I ever really needed them, I'd order from a chem supplier where I hold accounts. Unfortunately that's not an option for most people.
However, there's nothing to stop you from obtaining a prescription and ordering online. It will certainly be more cost effective that paying the prices I've indicated.
Another option if you're cleaver with chem, is extracting from milk. A liter of milk normally contains over 12 grams of L-tryptophan, but the procedure is not that simple. Details should be found using the bee search engine on
Synthetica