How often do I need to use Solius to start experiencing its benefits?

In a clinical study, the average user saw a 10 ng/mL increase in vitamin D levels using Solius once a week over a 15-week period. This would move the average person in the USA and Europe from "insufficient" to "sufficient" levels of vitamin D.Although Solius was designed for once-weekly sessions that last around five minutes (depending on your skin type), it is safe for everyday use – simple, efficient, and easy to fit into your routine.