copper proteinate

What it is

Copper bound to amino acids or peptides ('chelated'), which shields the metal through digestion and modestly improves absorption. The chelate advantage is real chemistry — most visible at marginal intakes or when minerals compete — and smaller than the premium-label glow suggests.

Why it's in pet food

Reliable copper delivery with a quality-signal accent: chelated minerals cost more, so their presence usually marks a formulator spending on the premix. That's a fair soft signal, not a guarantee of anything else.

How Bowlmark scores it

Scores are deterministic math over the printed label — the rules below apply to every product identically, and nothing estimates or fills in a blank.

Neutral — chelated and inorganic forms score identically because both meet requirements in a competent formulation, and the engine doesn't award style points for premix chemistry. Note the absorption arithmetic cuts both ways in the copper debate: better-absorbed copper is not automatically the right answer for a metal whose ceiling is under discussion. Dose, as ever, lives off-label.

Read the full methodology

Foods that list copper proteinate

Ranked by score where scores exist. Placement here is never sold.

• Whisker & Pine Free-Run Chicken & Sweet Potato Recipe94
• Open Farm Harvest Chicken & Ancient Grains Recipe93
• Open Farm Large Breed Grain-Free RawMix93
• Open Farm Large Breed RawMix with Ancient Grains93
• Open Farm Small Breed Chicken & Turkey Recipe93
• Open Farm Wild-Caught Salmon Dry Cat Food93
• Copperfield Cats Indoor Hairball Care Chicken & Brown Rice92
• Fernbrook Kitchens Heritage Rabbit Single-Protein Pâté92

Sources

• NRC Nutrient Requirements of Dogs and Cats (2006)
• WSAVA Global Nutrition Committee — Selecting a pet food

Related ingredients

• calcium carbonate
• calcium iodate
• copper sulfate
• dicalcium phosphate
• ethylenediamine dihydriodide
• zinc sulfate

Further reading

• The guaranteed analysis, decoded
• How to read a pet food label