thanks for asking this because i was literally just searching for the same thing today. there's a couple places like arcpoint labs that do specialty testing but i'm pretty sure they just do urine/blood screens to see what's in your system- not what's in the bottle. the "titrated" part is the real kicker because that requires some actual chem work that most commercial sites aren't set up for.

man i've been through this loop a dozen times lol. every time i find a lab that looks promising in the states they either want a business license or a doctor's referral to run a real analysis on a sample. it's super frustrating. honestly jano is basically the only name that ever comes up for a reason even if it takes forever to get stuff there and back.

just be careful with any "underground" us labs you find on telegram or whatever... lots of scammers out there claiming they have a mass spec in their garage. i’d stick to the well known names in the community even if it’s an international hassle. i’ve never heard of a us-based lab doing the specific titrated testing you're looking for without a massive headache- let me know if you prove me wrong though!