I regret to inform you that while this supplement may help some symptoms a little tiny bit, you're better off just buying the supplements yourself. It is a money game just like the clinic you found it in. It will be more effective and probably cheaper in the long run to get the stuff from a health food store.
There is no such thing as a symptom free detox.
I am on day 14 of methadone withdrawal myself. Or what should still be methadone w/d according to all the stories on the net, right?
I did a slow taper over the course of 11 months down to 4mg from a short stay at 120mg. It made me emotionless and dumb. Never again. Anyways, maybe it's the luck of the irish, I don't know, but I didn't feel hardly any withdrawal effects. A little RLS, and some anxiety from time to time. Marijuana and LOW-dose loperamide has been effective. The loperamide does tone down my symptoms quite a bit. Maybe it can be attributed from my stay under 10mg on methadone for about a month. I can't speak for people who've had monumental doses of H or Methadone for 30 years. But me, I've even been sleeping about 4 - 6 hours a night. You just have to stay calm. Practice meditation. Self-talk. Tell yourself it's going to be okay. (It is) The only thing that will allow you to have "zero symptoms" is your mind. You have to be ready to quit and you have to make that change in behavior to stop the constant need to seek drugs. All or nothing dude. My habit was pretty light, roughly 160 mg oxy a day for about 2 years at the end. 6 years all together. I can't speak for some of these people that seem to WANT to cold turkey 220 mg and all that, that is idiotic. I can imagine that probably IS hell! Remember the horror stories you read are just that: Scary stories. If you do a proper taper and prepare yourself to get off that stuff you will be surprised at your results.
Sorry for the rant, kind of all over the place.
Good luck!