L-lysine
L-lysine carries a source-backed screening score of 3/5 and appears in 29 indexed US food products.
Source-backed answer
L-lysine appears in 29 catalogued products. CSPI has no rating attached in this snapshot. Its FDA SAFFA status is “Approved.” Those source labels describe the ingredient; they do not establish whether a particular product, dose, allergy, or diet is safe.
- 29
- catalogued products
- #7,222
- usage rank of 247,206
- 19
- named brands represented
- 47%
- 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.
L-lysine: top-decile catalog footprint (#7,222 of 247,206)
- Usage rank
- #7,222
- of 247,206 ingredients that appear in at least one catalogued product, tied with 199 others that also appear in exactly 29 products.
- Typical depth in an ingredient list
- 47%
- Averaged label depth puts L-lysine in the upper half of the list (47% of list length, mean slot 24.1). Compound ingredients and OCR noise mean this cannot stand in for quantity.
Computed from parsed product ingredient lists (Open Food Facts). The ranking covers 247,206 ingredients that appear at least once. Neither usage rank nor label depth is a safety clearance.
How to use this page
Separate this ingredient from its product neighborhood
This is a mixed product neighborhood: 12 of 29 records have some flagged component, while the rest do not. Compare Amino K.e.m.; AMINO+ EAA/BCAA Strawberry Kiwi; Amino-9 Essentials Powder to see how surrounding formulations change; do not assign their 70–100 score range to L-lysine itself. The ingredient most often sits in the upper half of the list, and Dietary supplements supplies the most useful like-for-like starting point for a label review.
12 of 29 linked records have some flagged component
All 28 NOVA-classified records cluster most heavily in Group 4, while the first-category labels split across several shelves. That makes the 70–100 score spread more informative than the average alone: investigate the low end, identify the actual flagged row, and compare it with a similar unflagged formulation before drawing a conclusion.
Next check: pair one flagged product with a similar unflagged product from the same shelf category.
Function
NUTRIENT SUPPLEMENT
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-lysine
Products Containing L-lysine
16 busy labels from the 29 indexed products that list L-lysine:
Peer ingredients with comparable catalog mass
L-lysine sits among other busy catalog rows (29 products, mean score 92.9/100). Count peers and score peers are listed separately on purpose.
Similar mean product score
Score-axis peers only, mean screening score among ingredients with ≥50 scored products, not a second count list.
Next steps from the L-lysine page
29 product rows plus any FDA/CSPI fields on L-lysine are the evidence base — drill into the listings that matter for your decision.
- Check the listed products containing L-lysine before treating the aggregate count as a personal conclusion. Browse linked labels
- Compare another ingredient’s source-backed rating, FDA status, and product footprint. Open a peer record
- Read how PlainFoodSafe joins source records before treating a screening label as a personal food or health conclusion. Read the methodology
This page describes published source classifications and product-label coverage. It is not dietary, allergy, or medical advice.
L-lysine — common follow-ups
Does L-lysine carry its own safety label in this catalog? ▼
This is a mixed neighborhood: some linked products carry a separate flag while others do not. L-lysine itself carries and FDA SAFFA status "Approved" where the source record supplies them. Compare like-for-like products before treating the average screening score as an ingredient verdict.
Which product shelves show up most often with L-lysine? ▼
L-lysine ranks in the top decile by product count (#7,222 of 247,206), appearing in 29 indexed products led by Dietary supplements. The sample list below is a slice of that footprint, not the full universe.
What does L-lysine do in food? ▼
L-lysine is recorded as a nutrient supplement in source technical-effect fields.
Regulatory status: FDA SAFFA (L-lysine). 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.