darpar
I believe that is State specific. A prescription would be required in States in which recreational drugs are not legal or in a State which has a limit on potency and the person requires a higher strength script
We were just in Oregon which has many dispensaries and it's legal there, no prescription required.
Full list of of where legal/not legal here
https://en.wikipedia.org/wiki/Legality_of_cannabis_by_U.S._jurisdiction
Legal where i live and my town if 55,00 has 8 dispensaries . The Government also runs an online store to sell stuff, free delivery
Like with any drug the strength can vary, you choose based on the relative amount of THC and CBD desired, there are literally hundreds of products to choose from, edibles of which gummies fall under is just one.
Physicians can and do prescribe and that has been going on long before recreational drugs were made legal