Full record · 733739001139 · back to the summary
NOW Foods Supplements, (L-Lysine Hydrochloride) 1,000 mg
Free to read, download and share — no signup, no paywall, no ads.
How to read this report
What this is. We compare what a listing claims against what public records show — label arithmetic, barcode registries, NIH’s label catalog, FDA enforcement data, certification registries, and published research. Every statement below traces to one of those.
What the states mean. Confirmed = an outside source agrees. Contradicted = an outside source disagrees. Caution = something needs explaining. No data = we looked and found nothing — a gap, not a strike.
What it is not. A clean record is not an endorsement and never proof a product works. A thin record is not an accusation. We publish evidence and gaps; the conclusion is yours. Nothing here is medical advice.
Something wrong? Every figure is meant to be checkable — sources are named and linked. Send a correction and we’ll fix the record.
Every check we ran
Intake method matches the research
Nothing in this listing contradicts how these ingredients were studied (magnesium, collagen peptides). For example, magnesium: daily oral use; chelated forms (glycinate) are studied for absorption — note labels may state compound mass rather than elemental magnesium, which differs ~7-fold. Sources: NIH ODS — Magnesium fact sheet, PubMed search: magnesium glycinate supplementation.
Each ingredient’s amount is disclosed
The panel gives a per-ingredient amount rather than hiding quantities inside a proprietary blend, so each one can be compared to published research.
No data yet: Label math could not be verified
What this means: the listing doesn't publish net weight, per-serving dose, servings per container, so the dose claim can't be checked against physics from public data. That's neither a pass nor a strike — but it does mean you're taking the label on faith. Checkable products publish these numbers.
Not found in NIH's DSLD label registry
The NIH Dietary Supplement Label Database has no matching label yet. Ingestion lags the market — recorded as a gap, not a strike.
FDA recall appears in this brand's history
Brand-level context only, not a finding about this product. Now Foods recalled a different or not-exactly-bound product on 2025-05-08: “regular yeast was inadvertently packaged as nutritional yeast” (status: Terminated). The recalled product was: “NOW Nutritional Yeast Powder, Nt. Wt. 10oz. UPC 7 33739 02460 2” — not necessarily the product on this page. Verify at FDA’s recall database.
Barcode record is too sparse to confirm identity
Open Food Facts resolves 733739001139 to "Now l-lysine" (now), but that record lacks enough exact brand/product detail to confirm or contradict this listing.
180-day review-count history is on file
Exact-listing history records written-review counts from 2,219 on 2026-02-01 to 2,281 on 2026-07-21 (net +62). Count movements can reflect sales, listing variants, collection resets, or moderation; this history does not establish whether reviews are authentic.
What the listing promises — claim by claim
Why is this shown?
| Claim | Status | What we found |
|---|---|---|
| Manufacturing claim “…without Gluten, Dairy Free, Egg Free, Kosher GMP Quality Assured: A-rated, third-party certif…” | Claimed, not verifiable We looked for: the facility registration or certificate behind the claim | Facility-level claims can be accurate and still say nothing about this product’s contents. No registration document was located. |
| Benefit claim “…be obtained through diet or supplementation SUPPORTS COLLAGEN SYNTHESIS*: Necessary for the produ…” | Partly supported We looked for: whether the ingredient doses on the label match the doses used in published research | Published research exists for ingredients in this formula — see Related research below. Whether this product’s doses match those studies could not be confirmed. |
“No evidence located” does not mean a claim is false — it means the seller has not put evidence proportionate to the claim on the public record, and we could not find any. Absence of proof is not proof of absence.
This label vs. the doses studied
Why is this shown?
| Ingredient | Where this label sits | Reading |
|---|---|---|
| magnesium | Studies typically use 200 mg–420 mg. This product’s amount could not be read from public sources, so no comparison is possible. | |
| collagen peptides | Studies typically use 2.5 g–15 g. This product’s amount could not be read from public sources, so no comparison is possible. | |
Matching a studied dose does not mean the product works, and missing it does not mean it fails — it shows whether the label and the research are talking about the same amounts. Not a recommendation to take any amount.
Documented cautions
- magnesium — daily oral use; chelated forms (glycinate) are studied for absorption — note labels may state compound mass rather than elemental magnesium, which differs ~7-fold
Statements from published sources about these ingredients — not advice about this product, and not a complete safety review. Anyone taking medication should talk to a pharmacist or clinician.
Verifiability profile — 2 of 6 public signals
What this listing gives the public to check. Publishing these signals doesn't prove quality — but withholding them means claims can only be taken on faith.
Identity
| UPC (barcode) — also our record ID | 733739001139 |
| Brand | NOW Foods |
| Listing identifier | B000Z9361G |
| Retailer listing title | NOW Foods Supplements, (L-Lysine Hydrochloride) 1,000 mg, Double Stren… show full titleNOW Foods Supplements, (L-Lysine Hydrochloride) 1,000 mg, Double Strength, Amino Acid, 100 Tablets |
From the label (photo-read)
| Serving size | 1 Tablet |
| Badges printed on pack | Non-GMO, Vegetarian/Vegan, GMP ASSURED, GMP CERTIFICATION, intertek, Vitamin Angels®, FOUNDING PARTNER |
Supplement Facts panel (photo-read):
| Ingredient | Amount per serving | Reading confidence |
|---|---|---|
| L-Lysine | 1 g (1,000 mg) | High clearly legible in the photo |
Claims printed on the packaging:
“Double Strength” · “Essential Amino Acid” · “Supports Collagen Synthesis*” · “Healthy Immune Function*” · “Family owned since 1968.” · “Daily Value not established.” · “Made and quality tested in the USA with globally sourced ingredients.” · “This product has twice the L-Lysine (1,000 mg per tablet) as in our regular strength product (500 mg per tablet).”
Read by a vision model from 8 listing photos — verbatim extraction; OCR errors possible. Spot a mistake? It will be corrected on review.
Listed ingredients (as stated on the listing)
Supplement FactsServing Size:1 TabletServings Per Container:100DescriptionAmount per Serving% Daily ValueL-Lysine (from 1,270 mg L-Lysine Hydrochloride) 1 g (1,000 mg) ** Daily Value not established. **Daily Value not established.Other Ingredients: Microcrystalline Cellulose, Silicon Dioxide, Stearic Acid (vegetable source), Vegetarian Coating, Croscarmellose Sodium and Magnesium Stearate (vegetable source). Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens. Caution: For adults only. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Keep out of reach of children. This product has twice the L-Lysine (1,000 mg per tablet) as i
Related research & consistency
magnesium — NIH ODS — Magnesium fact sheet · PubMed search: magnesium glycinate supplementation · WebMD: magnesium · ClinicalTrials.gov — 3,206 registered studies
ℹ Use pattern in research: daily oral use; chelated forms (glycinate) are studied for absorption — note labels may state compound mass rather than elemental magnesium, which differs ~7-fold.
collagen peptides — PubMed search: collagen peptide supplementation trial · WebMD search: collagen · ClinicalTrials.gov — 587 registered studies
ℹ Use pattern in research: daily oral use over 8+ weeks in studies.
These notes state where label numbers and marketing framing sit relative to published research — documentation for your own judgment, not medical advice. LookCloser does not advise for or against taking any supplement.
Record 733739001139 · built July 21, 2026 · lookcloser.ai · corrections@lookcloser.ai