This green, round pill imprinted with JSP 523 is a Levothyroxine Sodium 0.3 MG Oral Tablet, per the NIH.
Levothyroxine Sodium is a human prescription drug. The active pharmaceutical ingredient is levothyroxine sodium and is classified as, "l-Thyroxine [EPC], Thyroxine [Chemical/Ingredient]."
This pill is made by a total of 2 firms: (1) Lannett Company, Inc., and (2) Med-Health Pharma, LLC
There is 1 other green pill that with a similar imprint: "JSP 523". They may be a different dosage of the same drug or a different drug entirely.