I heard good reviews about this product, but I haven't tried it...
https://www.amazon.com/Biopure-Liposomal-Melatonin-Phospholipid-Natural/dp/B01MPZU9BGDifficult supplements such as melatonin, B12 or glutathione work much better in liposomal form.
Ingested, they have little use (or small bio-availability, if not in this liposomal form).
I produce my own liposomal vitamins, with a cheap ultrasound device. It's so much cheaper than if you buy them, and I can control all ingredients inside.
I have another Facebook group only on how to produce your own liposomes at home.
It's called Liposomal Vitamins and Supplements. I share my recipes there.
https://www.facebook.com/groups/946905348850103/In the meantime, I hope others will chime in here and suggest something for you!