Non-soy protein sources have distinct metal profiles, so insect, plant and milk protein measurements cannot be treated as interchangeable.
- Metals of concern: lead, cadmium, arsenic, chromium and nickel are reported across different protein matrices
- Ingredient drivers: dairy feed and water, plant growing conditions, extraction and insect feed substrates
- Practical framing: insect-protein arsenic results do not describe milk-based formula; test each protein matrix and distinguish arsenic species
This page draws on 2 peer-reviewed studies. The complete citation list is at the bottom of the page.
Overview
This is a structural ingredient node created so product pages can link to a real wiki target. Occurrence values remain pending until a source is promoted for this ingredient.
Regulatory limits that apply
- EU Regulation 2023/915 maximum levels for contaminants in food — EU Reg. 2023/915 sets binding maximum levels for infant formula products into which non-soy protein sources are incorporated.
- US FDA Closer to Zero infant-and-young-child food framework: applicable to non-soy-protein-source-based finished products.
- Codex Alimentarius CXS 72-1981 (infant formula) and CXS 156-1987 (follow-up formula) establish composition standards.
- California Prop 65 (California Proposition 65) lead (Pb) MADL applies to non-soy-protein-source-based products sold in California.
Mitigation options
Sourcing levers (Supply-chain screening) are dominant. Protein-source-supplier specification at infant-grade impurity tier; supplier audit programs verifying upstream raw-material and processing-equipment quality.
Agronomic levers (Agronomic mitigation) operate at the source-protein cultivation or production stage (dairy farming for cow-milk protein; pea, rice, hemp cultivation for plant proteins; insect-feed-substrate quality for insect protein).
Processing levers (Processing mitigation) include ion-exchange polishing and ultrafiltration enhancements that reduce trace metals.
Formulation levers (Formulation mitigation) include matrix-substitution options (hydrolyzed cow-milk-protein vs amino-acid-based; pea-protein vs hemp-protein for plant-based products).
Testing and QC levers (Testing and quality-control mitigation) include lot-level Pb, cadmium (Cd), arsenic (As) testing on incoming protein source. HPLC-ICP-MS speciation per Sim 2024 is the operative method for inorganic arsenic (iAs)/total arsenic (tAs) distinction in protein matrices.
Packaging and storage levers (Packaging and storage mitigation) are minor; standard protein-product storage specifications apply.
Heavy metal contamination profile
This table summarizes the available occurrence evidence for each metal. A data gap means the literature was reviewed for this commodity and metal but no usable occurrence data was found. Key sources link to contributing studies.
| Analyte | Coverage | Typical (ppb) | Confidence | Key sources |
|---|---|---|---|---|
| lead (Pb) | data gap | — | — | — |
| cadmium (Cd) | data gap | — | — | — |
| inorganic arsenic (iAs) | data gap | — | — | — |
| total arsenic (tAs) | n=2 | 22500 | low | 1, 2 |
| total mercury (tHg) | data gap | — | — | — |
| nickel (Ni) | data gap | — | — | — |
| aluminum (Al) | data gap | — | — | — |
| chromium (Cr) | data gap | — | — | — |
| tin (Sn) | data gap | — | — | — |
| uranium (U) | data gap | — | — | — |
Routing
This node is linked from Infant Formula, Concentrated Liquid (Non-Soy), Infant Formula, Powder (Non-Soy), Infant Formula, RTF Liquid (Non-Soy).
Contamination Profile State
Per-analyte state — populated, in progress, or declared data gap — is carried authoritatively in the machine-readable contamination_profile frontmatter and the contamination-profile table above. Ingredient-level values belong here; finished-product values belong on the relevant product-category page.
Why this commodity accumulates heavy metals
Non-soy protein source is the aggregate ingredient label for protein bases in non-soy infant formula and alternative-protein finished products, covering cow-milk protein (intact, partially hydrolyzed, fully hydrolyzed), amino-acid-based protein, pea protein, rice protein, hemp protein, and emerging alternative proteins including insect protein. Each protein source carries its own heavy-metal profile inherited from its production pathway. Cow-milk protein from dairy farming carries forage-and-water inheritance plus background environmental Pb/Cd. Pea protein and rice protein concentrate the source-grain or source-legume metals during extraction. Insect protein (an emerging alternative-protein matrix) accumulates heavy metals from the substrate the insects feed on per Sim 2024’s HPLC-ICP-MS method validation on insect-protein matrices and Masite 2022’s mopane worm trace-metals work (which documents tAs, Cd, chromium (Cr), nickel (Ni), Pb in roasted mopane worms as an edible-insect alternative protein from the South African market at notably elevated levels).
The HMTc panel concerns for non-soy protein sources depend heavily on the specific protein matrix. The 22,500 ppb tAs cited in the body table is an outlier reading specifically from the mopane-worm and insect-protein evidence and reflects emerging-alternative-protein concerns that do not apply to commercial cow-milk-protein-based infant formula, which sits at the trace-Pb baseline documented on non-soy-infant-formula.
Ranges by source, region, and variety
Variance within non-soy protein sources tracks the specific protein matrix:
- Cow-milk protein: trace-Pb baseline, region-dependent on dairy-farming practices
- Pea protein: moderate Cd from source-pea soil-uptake
- Rice protein: source-rice iAs inheritance
- Hemp protein: source-hemp soil-uptake (hemp is a documented bioaccumulator and is used in phytoremediation contexts)
- Insect protein: highly substrate-dependent per Masite 2022; can carry elevated levels reflecting feed-substrate quality
Processing effects
Protein-extraction processes vary by matrix. Cow-milk protein isolation involves casein precipitation (curd separation) or whey-protein concentration via ultrafiltration; standard pasteurization and drying preserve the source-milk profile. Pea and rice protein extraction involves aqueous extraction at controlled pH followed by isoelectric precipitation similar to soy isolate. Insect protein production involves drying and grinding the source insect; metal load reflects feed-substrate inheritance.
Ingredient-derivative risk
Non-soy protein sources route into non-soy infant formulas (cow-milk-protein based primarily) and into broader protein-bar, protein-shake, plant-based meat, and nutritional-supplement applications. Each downstream product carries the source-protein metal profile diluted by other ingredients.
References
Works cited in this page’s text, in first-appearance order. See Sources for this page’s source inventory. Each title links to a source record with bibliographic details, reported findings, and document provenance.
- Determination of inorganic arsenic in seaweed, grain, grass silage, and insect protein by HPLC-ICP-MS using a design of experiments optimization approachPeer-reviewed
- Trace Metals, Crude Protein, and TGA-FTIR Analysis of Evolved Gas Products in the Thermal Decomposition of Roasted Mopane Worms, Sweet Corn, and PeanutsPeer-reviewed
Sources
Sources catalogued for this page. The last column says how each source is used here.
| # | Citation | Year | Type | Used on this page for |
|---|---|---|---|---|
| 1 | Barborakova et al. 2024. Safety of black soldier fly larvae: microbial and heavy metal risks, Journal of Microbiology, Biotechnology and Food Sciences | 2024 | Peer-reviewed | SK/EU Cd, Pb, Ni, Cr, Cu, Mn, Mo, Zn, Co occurrence in Black soldier fly larvae before experimental feeding and after four laboratory feed variants: egg pasta in whole milk,… (n=5) |
| 2 | Muntean et al. 2024. Evaluation of Alternative Sources of Proteins and Other Nutrients with Potential Applications in Fish Nutrition, Molecules | 2024 | Peer-reviewed | RO Al, Ni, tAs, Cd, Pb occurrence in Alternative protein flours for potential fish-nutrition use, including gastropod flours, hepatopancreas flour, sunflower, hemp, flax, pumpkin, coffee grounds,… (n=55) |
| 3 | Sim et al. 2024. Determination of inorganic arsenic in seaweed, grain, grass silage, and insect protein by HPLC-ICP-MS using a design of experiments optimization approach, Food Chemistry | 2024 | Peer-reviewed | HPLC-ICP-MS validated iAs method applied to insect-protein samples as a non-soy protein matrix |
| 4 | Masite et al. 2022. Trace Metals, Crude Protein, and TGA-FTIR Analysis of Evolved Gas Products in the Thermal Decomposition of Roasted Mopane Worms, Sweet Corn, and Peanuts, International Journal of Food Science | 2022 | Peer-reviewed | tAs, Cd, Cr, Ni, and Pb in roasted mopane worms as an edible-insect alternative-protein source from the South African market |
| 5 | Bandara et al. 2020. A human health risk assessment of heavy metal ingestion among consumers of protein powder supplements, Toxicology Reports | 2020 | Peer-reviewed | US tAs, Cd, Pb, tHg occurrence in Risk assessment built on heavy-metal concentrations reported in two US third-party testing datasets: 15 protein powder products from… (n=148) |
| 6 | Hosojima et al. 2017. A Randomized, Double-Blind, Crossover Pilot Trial of Rice Endosperm Protein Supplementation in Maintenance Hemodialysis Patients, Scientific Reports | 2017 | Peer-reviewed | JP Cd occurrence in Five batches of rice endosperm protein powder prepared from Japonica rice flour for a maintenance-hemodialysis nutrition intervention in… (n=5) |
Update history
No substantive edit history is available in this build. The full commit record is available in git.