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
Animal (poultry) data suggest higher relative bioavailability than MnSO4, but NIH ODS confirms no human data exist -- not willing to assert a human-relevant tier on animal-only evidence.
Source: uncertain -- needs review (animal/poultry evidence only)
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/
Tiers summarize published comparative bioavailability or outcome evidence for each form (see methodology).
This page describes the market; it is not a recommendation to take either form. Talk to a clinician about what's right for you.