Comment · Wed, December 24, 2025 · ND Owner
ND products testing positive for heavy metals
Original post in this thread
birdnerdcatlady · 0 points
I just got a shipment of L Carnosine and Mg glycinate today. I tested them both for heavy metals. Both are positive for lead and the Mg glycinate also tested positive for cadmium. I used 2 different test strips, both tested for lead only (both tests positive for each supplement) and one tested for multiple heavy metals. Has anybody else tested their supplments? For comparison my ND L Theanine tested negative for all metals .
What they were answering
Exciting_Research120 · 9 points
Reagent tests suck for this in general, but the mg is itself causing the (false?) positive for that one (almost certainly). If you want to verify any of this for yourself you need to send it to an actual lab, but you can be %99 sure if there’s a discrepancy between your (probably shitty) reagent test and the ND spec id go by the spec.
For the carnosines Pb content I have no idea what unit 20 is here, if it’s ppb or mcg/L that would be high for tap water, but the amount you ingest of this is so much lower than water it still would not be of concern, and is within spec for nds carnosine (.04ppm/40ppb).
u/MisterYouAreSoDumb · ND Owner
A simple Google search would have shown this is a false positive due to matrix interferences.