Idk if it help for wd much but for tappering down i know it does help for kratom at least by my experience but you have to do some research for methadone. I don’t take anymore buprenorphine since 20 days. I was at 0.4mg bupre, then switched to kratom (5g 3x/day) and then tappered down to 1g of kratom twice a day with the help off black seed oil and I really felt like it was helpfull. Now just taking 1 day kratom and sport/ 1 day dissociative ...
But everyone is different from what i’ve experienced Blackseed oil with high thymoquinone, rhodiola and ashwagandha can help tappering faster. The hardest is at the end i’d suggest to keep the Kratom for that moment.