Manganese Amino Acid Chelate
Manganese Amino Acid Chelate is a unrated form of Manganese, used in 1,310 on-market products and providing 27.0% elemental manganese by weight.
1,310
on-market products
unrated
quality tier
27.0%
elemental fraction
Basis: Mn(C2H4NO2)2, pure 1:2 stoichiometric chelate, MW 203.06 (commercial raw material may be diluted, lowering actual %)
Why this tier: Some animal (poultry) data are said to suggest higher relative bioavailability than MnSO4 (not cited here), but NIH ODS confirms no human data exist -- not willing to assert a human-relevant tier on animal-only evidence.
Source: https://ods.od.nih.gov/factsheets/Manganese-HealthProfessional/ (no human data); the animal/poultry evidence is not cited