Every ingredient 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.
Full record · lc-058facdb · back to the summary
21st Century Sentry Senior Tablets, 265 Count
Exact product checkedGTIN not published · checked 2026-07-27
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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.
Panel, decoded
What the label discloses
25listed rows
25separately quantified
0combined blend totals
The listing-image panel publishes an amount for each of its 25 listed rows. That supports ingredient-by-ingredient review; it does not verify the contents.
| Panel row | Amount | %DV | What to notice |
|---|---|---|---|
| Vitamin A (Acetate, 40% as Beta-Carotene) | 750 mcg | — | |
| Vitamin C (as Ascorbic Acid) | 60 mg | — | |
| Vitamin D3 (as Cholecalciferol) | 25 mcg | — | |
| Vitamin E (as dl-Alpha Tocopheryl Acetate) | 22.5 mg | — | |
| Vitamin K (as Phytonadione) | 30 mcg | — | |
| Thiamin (as Thiamin Mononitrate, B-1) | 1.5 mg | — | |
| Riboflavin (as Vitamin B-2) | 1.7 mg | — | |
| Niacin (as Niacinamide) | 20 mg | — | |
| Vitamin B-6 (as Pyridoxine HCl) | 3 mg | — | |
| Folate (400 mcg Folic Acid) | 667 mcg DFE | — | |
| Vitamin B-12 (as Cyanocobalamin) | 25 mcg | — | |
| Biotin | 30 mcg | — | |
| Pantothenic Acid (as d-Calcium Pantothenate) | 10 mg | — | |
| Calcium (as Calcium Carbonate & Dicalcium Phosphate) | 220 mg | — | |
| Phosphorus (as Dicalcium Phosphate) | 20 mg | — | |
| Iodine (as Potassium Iodide) | 150 mcg | — | |
| Magnesium (as Magnesium Oxide) | 50 mg | — | |
| Zinc (as Zinc Oxide) | 11 mg | — | |
| Selenium (as Sodium Selenate) | 19 mcg | — | |
| Copper (as Copper Sulfate) | 0.5 mg | — | |
| Manganese (as Manganese Sulfate) | 2.3 mg | — | |
| Chromium (as Chromium Picolinate) | 50 mcg | — | |
| Molybdenum (as Sodium Molybdate) | 45 mcg | — | |
| Chloride (as Potassium Chloride) | 72 mg | — | |
| Potassium (as Potassium Chloride) | 80 mg | — |
FDA rules (21 CFR 101.36) require the amount of each dietary ingredient per serving unless hidden in a listed “proprietary blend” (legal, but a transparency yellow flag). A label stating no amount at all is non-compliant — a checkable red flag. This panel states amounts; the open question is whether those listed amounts are independently verified and how they compare with relevant research.
vision:claude-cli:subscription Amounts are shown as listed panel data, not independently lab-tested contents.
Every check we ran
Confirmed evidence
What checked out2
These checks found support in the public record. They confirm specific facts, not the product as a whole.
Confirmed
The review count moved gradually, not in one burst
Written reviews rose from 157 to 228 between July 14, 2025 and July 21, 2026. The largest rise inside any single 30-day window was about 11, so the count moved in steps rather than in one burst.
Documented concerns
What needs caution0
These are documented contradictions or claims that need more evidence. They are separate from missing data.
No contradictions or product-specific cautions were found at this check depth.
Unresolved public record
What is still missing8
We looked for these signals but could not settle them from public sources. A gap is not a strike.
Multiple USPTO brand-owner records are shown
USPTO returned multiple live supplement-class records for the exact brand wordmark: Twenty-First Century Laboratories, Inc., Twenty-First Century HealthCare, Inc., Twenty First Century Nutritional Products, Inc.. These records answer who owns registrations for the brand; the separate product-to-owner or manufacturer link remains open.
“Lab tested” claimed, but no lab or report named
The observed listing claims third-party testing without naming a lab or certifier. No product-bound report is saved, so the claim cannot be verified as stated. Under NSF/ANSI 173, NSF lists 21st Century HealthCare, Inc. products, but the saved registry result does not cover this exact SKU. IFOS, USP, and Informed-Sport were not checked in this record.
Multi-ingredient formula — panel read, serving weight unknown
We read the full Supplement Facts panel from the listing-image panel (below), but the label doesn’t state a serving weight, so the arithmetic can’t run. A gap in the label’s information, not evidence of a problem.
Research context is available for the listed ingredients
Published sources describe how magnesium, zinc have been studied. This is ingredient context only; the record does not establish that this product delivers the studied dose or outcome. Sources: NIH ODS — Magnesium fact sheet, PubMed search: magnesium glycinate supplementation.
Certified by NSF — contents and contaminants checked
21st Century HealthCare, Inc. appears in NSF’s certified-products registry with 0 certified product(s), but we couldn’t confirm this exact listing is among them. Certification covers contents and contaminants — not effectiveness.
FDA recall appears in this brand's history
This recall is not about the product on this page. Twenty-First Century Healthcare, Inc recalled a different product on May 7, 2021. FDA has since closed that case. The recalled item was “21st Century Vitamin D3 125 mcg (5000 IU) tablet, 100 count, UPC 7-40985-27431-6, 21st Century HealthCare, Inc., 2119 Wilson St., Tempe, AZ 85282”. FDA recorded the reason as “A small quantity of bottles of Vitamin D3 125 mcg ((5000 IU) 100 ct. were mislabeled as Vitamin D3 25 mcg (1000 IU). Secondary labeling on the bottles (back label) is correctly labeled as Vitamin D3 125 mcg (5000 IU)”. Verify at FDA’s recall database.
This item belongs to a catalog variation family
The paid catalog links this exact item to a parent listing. Review counts on public product pages may be shared across sizes, flavors, or other variants, so the count history is listing context — not evidence that reviewers received or tested this exact variant.
180-day review-count history is on file
Exact-listing history records written-review counts from 156 on 2025-07-01 to 228 on 2026-07-21 (net +72). Count movements can reflect sales, listing variants, collection resets, or moderation; this history does not establish whether reviews are authentic.
What to ask and check
What would settle the open questions
Why is this shown?
Everything we couldn’t verify is something a person can still ask about. Rather than leave gaps sitting as dead ends, we turn each one into a specific question — the exact document, citation, or number that would settle it — plus the things you can confirm yourself with the bottle in your hand.
Ask the brand or seller
1
Can you send the certificate of analysis (COA) for the lot number on my bottle?
A real COA names the testing laboratory, the test date, the lot it covers, and what was measured. “Third-party tested” with no document behind it is a marketing sentence.
2
What is the product’s UPC or GTIN?
The barcode is how a product gets matched to outside records — certification registries, label databases, recall data. Without it, almost nothing can be cross-checked.
3
Is this label filed with NIH’s Dietary Supplement Label Database (DSLD)?
Filing is voluntary, so absence proves nothing — but a filed label puts the full ingredient table on public record where anyone can read it.
Most brands and sellers publish a contact route. A clear answer adds evidence to the record; no answer leaves the question open.
Check for yourself — no one’s permission needed
1
Compare the panel on the bottle in your hand to the one shown in this record.
Ours was read from listing photos and can contain reading errors. The physical label is the source of truth — if they disagree, tell us and we’ll correct the record.
2
Look the product up yourself in NSF’s certified-products registry.
Search “21st Century HealthCare, Inc.” at info.nsf.org — certification covers contents and contaminants, not effectiveness.
3
Check the lot number and expiry on the bottle against any COA you’re given.
A certificate that doesn’t name your lot doesn’t describe what you’re holding.
These are the open questions on this specific record — not a warning about the product, and not a suggestion to buy or avoid it. Getting them answered is how you decide for yourself.
What the listing promises — claim by claim
Why is this shown?
A listing’s promises are the reason people buy. Each one gets its own row: what was promised, what evidence would settle it, and what we could actually find. We never call a claim false — only whether proof proportionate to it exists on the public record.
| Claim | Status | What we found |
|---|---|---|
| Quality-testing claim “…Third-Party Lab Tested…” | Claimed, not verifiable We looked for: the observed listing, saved brand product page, the NSF/ANSI 173 certified-products registry, any linked COA or test report; IFOS, USP, Informed-Sport were not queried | No named laboratory or lot-specific certificate was found for this exact product. No exact brand product page was available for a document check. IFOS, USP, and Informed-Sport were not checked in this record. This is a public-evidence limit, not a finding that testing did not occur. |
| Manufacturing claim “…GMP Certified & FDA Registered…” | Partly supported We looked for: the facility registration or certificate behind the claim | “GMP-certified” describes factory processes, not what is in the bottle. The claim does not name a certifier or public register that a shopper can check. |
| Benefit claim “…COMPLETE DAILY MULTIVITAMIN FOR ADULTS 50+* - Each tablet delivers 20+ essential vitamins and minerals including Vitamin D3 (1,000 IU), B12 (25 mcg), Calcium (220 mg), M” | 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. 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?
An ingredient can be well-studied at one amount and barely studied at the amount in your bottle. This lines the label up against the doses researchers actually used. It answers ‘are these the same numbers?’ — never ‘should you take this?’
| Ingredient | Where this label sits | Reading |
|---|---|---|
| Magnesium (as Magnesium Oxide) | shaded = doses used in studies (200 mg–420 mg) · bar = this label | 50 mg — below the studied range |
| Zinc (as Zinc Oxide) | shaded = doses used in studies (8 mg–40 mg) · bar = this label | 11 mg — within the studied range |
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
- zinc — daily oral use; sustained high intakes can interfere with copper absorption — a documented interaction, not advice
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
✓ Supplement Facts visible in photos✓ Brand's own store found· Per-serving dose established — not published· UPC / GTIN published — not published· Found in NIH's label catalog (DSLD) — not published· Third-party lab named or registry-certified — not published
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
| LookCloser record ID | lc-058facdb (internal — no barcode published, which limits cross-checking) |
| Brand | 21st Century |
| Source listing identifier | B0007PLP0W |
| USPTO brand-owner record | Twenty-First Century Laboratories, Inc. · ARIZONA, USA · registration 3645342 · 2119 South Wilson Street, Tempe, ARIZONA 85282, UNITED STATES |
| USPTO brand-owner record | Twenty-First Century HealthCare, Inc. · ARIZONA, USA · registration 4085491 · 443 West Alameda Drive, Tempe, ARIZONA 85282, UNITED STATES |
| USPTO brand-owner record | Twenty First Century Nutritional Products, Inc. · ARIZONA, USA · registration 1790110 · 2445 West 12th Street, Tempe, ARIZONA 85281, UNITED STATES |
From the label (photo-read)
| Serving size | Serving Size 1 Tablet |
| Pack statement | 265 Tablets |
| Badges printed on pack | Non-GMO, Gluten Free, Third-Party Lab Tested, GMP Certified & FDA Registered, Packaged in the U.S.A. |
Supplement Facts panel (photo-read):
| Ingredient | Amount per serving | Reading confidence |
|---|---|---|
| Vitamin A (Acetate, 40% as Beta-Carotene) | 750 mcg | High clearly legible in the photo |
| Vitamin C (as Ascorbic Acid) | 60 mg | High clearly legible in the photo |
| Vitamin D3 (as Cholecalciferol) | 25 mcg | High clearly legible in the photo |
| Vitamin E (as dl-Alpha Tocopheryl Acetate) | 22.5 mg | High clearly legible in the photo |
| Vitamin K (as Phytonadione) | 30 mcg | High clearly legible in the photo |
| Thiamin (as Thiamin Mononitrate, B-1) | 1.5 mg | High clearly legible in the photo |
| Riboflavin (as Vitamin B-2) | 1.7 mg | High clearly legible in the photo |
| Niacin (as Niacinamide) | 20 mg | High clearly legible in the photo |
| Vitamin B-6 (as Pyridoxine HCl) | 3 mg | High clearly legible in the photo |
| Folate (400 mcg Folic Acid) | 667 mcg DFE | High clearly legible in the photo |
| Vitamin B-12 (as Cyanocobalamin) | 25 mcg | High clearly legible in the photo |
| Biotin | 30 mcg | High clearly legible in the photo |
| Pantothenic Acid (as d-Calcium Pantothenate) | 10 mg | High clearly legible in the photo |
| Calcium (as Calcium Carbonate & Dicalcium Phosphate) | 220 mg | High clearly legible in the photo |
| Phosphorus (as Dicalcium Phosphate) | 20 mg | High clearly legible in the photo |
| Iodine (as Potassium Iodide) | 150 mcg | High clearly legible in the photo |
| Magnesium (as Magnesium Oxide) | 50 mg | High clearly legible in the photo |
| Zinc (as Zinc Oxide) | 11 mg | High clearly legible in the photo |
| Selenium (as Sodium Selenate) | 19 mcg | High clearly legible in the photo |
| Copper (as Copper Sulfate) | 0.5 mg | High clearly legible in the photo |
| Manganese (as Manganese Sulfate) | 2.3 mg | High clearly legible in the photo |
| Chromium (as Chromium Picolinate) | 50 mcg | High clearly legible in the photo |
| Molybdenum (as Sodium Molybdate) | 45 mcg | High clearly legible in the photo |
| Chloride (as Potassium Chloride) | 72 mg | High clearly legible in the photo |
| Potassium (as Potassium Chloride) | 80 mg | High clearly legible in the photo |
Claims printed on the packaging:
“Adults 50+” · “Multivitamin & Multimineral Supplement” · “Compare VS. Centrum® SILVER® Adults†” · “265 Tablets” · “21st Century Sentry Senior Multivitamins are specifically formulated for seniors and health-conscious elderly individual” · “Key Benefits for Seniors” · “Support Overall Wellness and Vitality in the Golden Years*” · “Formulated Specifically to Address Nutrient Gaps that Commonly Occur with Age*”
Read by a vision model from 8 listing photos — verbatim extraction; OCR errors possible. Spot a mistake? It will be corrected on review.
Ingredient science — NIH references
Vitamin A — NIH ODS · MedlinePlus · PubMed (10,699) · UL 3000 mcg (preformed vitamin A (retinol); excludes beta-carotene)
Vitamin C — NIH ODS · MedlinePlus · PubMed (11,019) · UL 2000 mg (total intake, adults)
Vitamin D — NIH ODS · MedlinePlus · PubMed (26,500) · UL 100 mcg (adults; 100 mcg = 4,000 IU)
Vitamin E — NIH ODS · MedlinePlus · PubMed (12,326) · UL 1000 mg (supplemental alpha-tocopherol, adults)
Vitamin K — NIH ODS · MedlinePlus · PubMed (2,124) · no UL established; interacts with warfarin
Thiamin — NIH ODS · MedlinePlus · PubMed (1,262) · no UL established
Riboflavin — NIH ODS · MedlinePlus · PubMed (3,172) · no UL established
Niacin — NIH ODS · MedlinePlus · PubMed (2,689) · UL 35 mg (supplemental/added niacin, adults)
Folate — NIH ODS · MedlinePlus · PubMed (10,628) · UL 1000 mcg (synthetic folic acid from supplements/fortified food)
Biotin — NIH ODS · MedlinePlus · PubMed (1,606) · no UL; high doses interfere with lab tests
Pantothenic Acid — NIH ODS · MedlinePlus · PubMed (601) · no UL established
Calcium — NIH ODS · MedlinePlus · PubMed (48,938) · UL 2500 mg (adults 19-50 (2,000 mg for 51+))
Phosphorus — NIH ODS · MedlinePlus · PubMed (13,233) · UL 4000 mg (adults 19-70)
Iodine — NIH ODS · MedlinePlus · PubMed (6,462) · UL 1100 mcg (adults)
Magnesium — NIH ODS · MedlinePlus · PubMed (11,814) · UL 350 mg (SUPPLEMENTAL magnesium only (not from food))
Zinc — NIH ODS · MedlinePlus · PubMed (19,708) · UL 40 mg (adults, from all sources)
Selenium — NIH ODS · MedlinePlus · PubMed (12,481) · UL 400 mcg (adults)
Copper — NIH ODS · MedlinePlus · PubMed (9,405) · UL 10 mg (adults)
Manganese — NIH ODS · MedlinePlus · PubMed (3,608) · UL 11 mg (adults)
Molybdenum — NIH ODS · MedlinePlus · PubMed (809) · UL 2000 mcg (adults)
Potassium — NIH ODS · MedlinePlus · PubMed (16,128) · no UL; supplements capped at 99 mg OTC
Reference data from the NIH Office of Dietary Supplements, IOM Dietary Reference Intakes, and PubMed. A Tolerable Upper Intake Level is a documented reference figure, not a safety verdict — both the listed amount and the reference are shown for your own judgment. LookCloser gives no medical advice.
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.
zinc — NIH ODS — Zinc fact sheet · PubMed search: zinc supplementation trial · ClinicalTrials.gov — 1,598 registered studies
ℹ Use pattern in research: daily oral use; sustained high intakes can interfere with copper absorption — a documented interaction, not advice.
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 lc-058facdb · built July 27, 2026 · lookcloser.ai · corrections@lookcloser.ai