Manganese Amino Acid Chelate vs. Manganese Citrate
Among 4,675 on-market manganese products with an identifiable primary form, 28% use Manganese Amino Acid Chelate (1,309 products) and 19.2% use Manganese Citrate (898).
| Manganese Amino Acid Chelate | Manganese Citrate | |
|---|---|---|
| Quality tier | Unrated | Tier 2 |
| Manganese by weight | 27.0% | 30.3% |
| Share of market | 28% | 19.2% |
| On-market products | 1,309 | 898 |
| Median declared dose | 2,000 elemental mcg middle half: 1,000–4,800 | 2,000 elemental mcg middle half: 1,000–2,700 |
| Most common brands | NOW, XYMOGEN, Bluebonnet | Ultima, Metagenics, Pure Encapsulations |
Doses are declared per serving in elemental mcg. “By weight” is the share of the ingredient that is the nutrient itself (e.g. elemental magnesium in a magnesium salt).
Why Manganese Amino Acid Chelate is unrated
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
Why Manganese Citrate is tier 2
Same caveat as sulfate -- no human comparative data exists; acceptable by convention only.
Source: https://ods.od.nih.gov/factsheets/Manganese-HealthProfessional/