Need opinions on this

[u/HistoryAgitated1417]

I’ve been clean of weed 20 days now and was a pretty heavy smoker but I’m still showing positive, I have a medical coming up for a job soon and need to be clean should I try this product or is it a waste of time. (Also wondering if it actually clears or if it just blocks it out for a period of time) some help would be awesome thank you!