Manganese Gluconate
Manganese Gluconate is a tier 2 form of Manganese, used in 1,162 on-market products and providing 12.3% elemental manganese by weight.
1,162
on-market products
tier 2
quality tier
12.3%
elemental fraction
Basis: Mn(C6H11O7)2, anhydrous, MW 445.26
Why this tier: Same caveat -- no human comparative bioavailability data located; acceptable by convention only.
Source: https://ods.od.nih.gov/factsheets/Manganese-HealthProfessional/