Currently, all vitamin C-containing supplements or medications available on the market are dextrorotatory.

Naturally occurring or sourced vitamin C is also dextrorotatory.

According to the notation for the optical activity of chiral molecules, dextrorotatory is denoted as d or (+), while levorotatory is denoted as l or (-). Pharmaceutical-grade vitamin C is dextrorotatory, with an optical rotation value falling between +20.5° and +21.5°.

The correct name for L-(+)-ascorbic acid should be "l-form dextrorotatory vitamin C."

The optical activity of chiral molecules significantly affects their activity, and dextrorotatory vitamin C is the active form.