Is 20 mg of Accutane effective?

https://www.dosepharmacy.com/tretiva-40mg-capsule

The results of the current study demonstrated that low dose isotretiinoin (20 mg/day) is an effective and well-tolerated alternative to the conventional (0.5–1 mg/kg/day) approach for the treatment of moderate to severe acne. The main drawback is that the treatment period is longer than 10 months.