Recommend a (low dose) melatonin brand?

I'm aware of the risks of supplementing continually at high doses, but I'm interested in trying at a low dose occasionally to deal with jet lag or resetting my sleep schedule etc.

Are there any brands that are third-party tested or considered "gold standard" for melatonin? I know it's the wild west out there in terms of accurate amounts and quality in supplements. I'd hopefully like to get my money's worth.