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Re:Ask HN: What did you purchase that measurably improved yo... by CodinM on Sunday October 18, 2020 @03:37PM (#24820463)
L-DOPA as well as L-Citrulline are Rx only, so you're either outside of US/EU or you suffer from some condition that requires that medication.
Re:Ask HN: What did you purchase that measurably improved yo... by vijay_nair on Sunday October 18, 2020 @10:55PM (#24822960)
No condition and no medical diagnosis. For the past few years I've been afflicted by periods of existential crisis and L-DOPA short circuits this. Much better mood, focus and most importantly — drive (which is what helps most with the EC). Feels almost as good as how I felt when in my teens¹.

As others have mentioned I simply buy them off of Amazon.

¹completed my 37th trip around the sun yesterday, the 17th.

Re:Ask HN: What did you purchase that measurably improved yo... by frank2 on Monday October 19, 2020 @04:31PM (#24830667)
If citrulline were Rx-only in the US, then I doubt Doctor's Best would make it and I doubt Walmart would sell it:

https://www.walmart.com/ip//150061958

Re:Ask HN: What did you purchase that measurably improved yo... by underdown on Sunday October 18, 2020 @03:57PM (#24820611)
L-citrulline is on the GRAS list. There are dozens of supplements for sale on Amazon.
Re:Ask HN: What did you purchase that measurably improved yo... by Slightofhand on Sunday October 18, 2020 @03:55PM (#24820592)
What does Rx mean?
Re:Ask HN: What did you purchase that measurably improved yo... by aYsY4dDQ2NrcNzA on Sunday October 18, 2020 @04:06PM (#24820684)
Prescription. As in, prescribed by a physician.
Re:Ask HN: What did you purchase that measurably improved yo... by jakebasile on Sunday October 18, 2020 @04:03PM (#24820664)
"Prescription"
Re:Ask HN: What did you purchase that measurably improved yo... by dzhiurgis on Sunday October 18, 2020 @04:17PM (#24820783)
Prescription-only