Manganese Sulfate
Manganese Sulfate is a tier 2 form of Manganese, used in 1,318 on-market products and providing 32.5% elemental manganese by weight.
1,318
on-market products
tier 2
quality tier
32.5%
elemental fraction
Basis: MnSO4 x H2O, monohydrate (USP monograph commercial form; anhydrous at 0.364 also exists)
Why this tier: NIH ODS states no human comparative bioavailability data exist across manganese forms; treated as "acceptable by convention" (soluble reference salt used in mostly-animal research), not evidence-ranked.
Source: https://ods.od.nih.gov/factsheets/Manganese-HealthProfessional/