L. Cysteine
L. Cysteine appears in 46 indexed US food products. No FDA SAFFA status or CSPI rating is attached in this snapshot, so this page reports prevalence rather than a safety verdict.
What the data can answer
L. Cysteine appears in 46 catalogued products, but this snapshot has no FDA SAFFA status or CSPI Chemical Cuisine rating attached to it. This page therefore cannot answer whether the ingredient is safe from those sources. It can show how often it occurs, where it tends to sit on labels, and which kinds of products contain it.
- 46
- catalogued products
- #5,260
- usage rank of 247,206
- 14
- named brands represented
- 49%
- average depth down ingredient lists
Catalog prevalence comes from Open Food Facts ingredient lists. FDA SAFFA and CSPI Chemical Cuisine labels are shown only when the source record contains them.
Reading this ingredient record
Audit the co-occurring flags first
89.1% of the linked products contain at least one separately flagged ingredient, making co-occurrence the dominant follow-up question. That figure does not identify L. Cysteine as the trigger. Open records such as 6 Submarine Rolls; 6.25 Oz pizza meal; Bakers Best, White Bread and inspect which ingredient row carries the caution marker. The 74.6/100 product average is therefore a triage signal for this surrounding formulation set, not an ingredient verdict. Its 49% average label depth helps locate the term when checking the package.
89.1% of linked products contain a separately flagged ingredient
Processing is unusually concentrated here: Group 4 accounts for 45 of 46 NOVA-tagged records. That describes the surrounding products, not the substance. For a useful comparison, hold category and processing level constant, then inspect which named component changes alongside the caution flag; otherwise the product mix will confound the ingredient question.
Next check: open the lowest-scoring linked formulation and locate the exact caution-marked component.
High-volume listing for L. Cysteine - usage rank #5,260
- Usage rank
- #5,260
- of 247,206 ingredients that appear in at least one catalogued product, tied with 72 others that also appear in exactly 46 products.
- Typical depth in an ingredient list
- 49%
- Of the way down the captured list, averaged across the 46 products listing it (mean slot 28.4). L. Cysteine usually falls in the upper half of the list; this position does not measure its amount because source formatting, compound ingredients and labeling exceptions vary.
Derived by this site from the ingredient lists of every catalogued product (Open Food Facts), recomputed on each data refresh. 247,206 ingredients have at least one appearance and are ranked here. Usage and list position describe prevalence, not safety.
What else is usually in the same product as L. Cysteine
Across the 46 products on this site that list L. Cysteine, these flagged additives appear alongside it most often. The comparison column is how often each one appears across every product with a parsed ingredient list, so the two figures are measured over the same set. Sodium Nitrite shows up about 19x more often with L. Cysteine than in the catalogue at large.
| Additive | Shared products | Share of L. Cysteine products | Share of all products |
|---|---|---|---|
| Sodium Nitrite | 21 | 45.7% | 2.4% |
| BHA | 12 | 26.1% | 0.7% |
| BHT | 12 | 26.1% | 1.1% |
| Azodicarbonamide | 11 | 23.9% | 0.2% |
| Caramel Coloring | 9 | 19.6% | 5.7% |
Co-occurrence describes what manufacturers formulate together. It is not a claim that these additives interact, and it carries no regulatory meaning. Counted over products with parsed ingredient lists; Open Food Facts, 2026-09-01.
How do the sampled products compare?
Each point is one of the 16 sampled products listed below: its overall safety score against how many separately flagged ingredients its label carries. Bubble size is the number of ingredient rows the label actually resolved to.
Safety score vs. flagged-ingredient count for products containing L. Cysteine
Products Containing L. Cysteine
High-volume slice (16 of 46) for products naming L. Cysteine:
Peer ingredients with comparable catalog mass
L. Cysteine sits among other busy catalog rows (46 products, mean score 74.6/100). Count peers and score peers are listed separately on purpose.
Similar mean product score
Mean product-score neighbours (≥50 scored products), kept separate from the product-count peers above.
Using the L. Cysteine evidence
46 product rows plus any FDA/CSPI fields on L. Cysteine are the evidence base — drill into the listings that matter for your decision.
- Review the sampled product records that list L. Cysteine to see how the ingredient appears in actual labels. Open product sample
- Move to a second ingredient page and compare registry fields plus catalog mass side by side. Compare a peer
- Check the methodology for how FDA SAFFA, CSPI, and Open Food Facts rows are joined on this site. Open methodology
This page describes published source classifications and product-label coverage. It is not dietary, allergy, or medical advice.
L. Cysteine — common follow-ups
How should I read safety signals when L. Cysteine sits in heavily flagged products? ▼
89.1% of linked products contain at least one separately flagged ingredient, so the first task is locating which row carries the caution marker — not assuming L. Cysteine is the trigger. None of that replaces a product-, dose-, allergy-, or person-specific determination.
Which product shelves show up most often with L. Cysteine? ▼
L. Cysteine ranks in the top decile by product count (#5,260 of 247,206), appearing in 46 indexed products led by Meals. The sample list below is a slice of that footprint, not the full universe.
Why is L. Cysteine so common on ingredient lists? ▼
The source record does not name a technical effect, yet L. Cysteine appears in 46 products (#5,260 usage rank). High prevalence here describes formulation frequency, not an approved use level.
Regulatory status: FDA SAFFA (L. Cysteine). Safety ratings: CSPI Chemical Cuisine; product presence: Open Food Facts via PlainFoodSafe (September 2026). Figures are computed from those sources, no editor-typed counts. Methodology · State regulations.