full reportFull record · 810390029198 · back to the summary
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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.
We did the comparison: the listing title uses 135 mg, which equals Calcium 25 mg + Magnesium (as Magnesium Chloride) 12 mg + Sodium (as Sodium Citrate) 60 mg + Potassium (as Dipotassium Phosphate) 20 mg. It is a combined amount, not the amount of one ingredient. The full listed active total is 4.436 g including the other panel rows. This explains the label framing; it does not independently test the contents.
| Panel row | Amount | %DV | What to notice |
|---|---|---|---|
| Calories | 5 | — | |
| Total Carbohydrate | 1 g | — | |
| Total Sugars | 0 g | — | |
| Includes 0g Added Sugars | 0 g | — | |
| Vitamin B6 (as Pyridoxine HCl) | 3.4 mg | — | |
| Vitamin B12 (as Cyanocobalamin) | 60 mcg | — | |
| Calcium | 25 mg | — | |
| Magnesium (as Magnesium Chloride) | 12 mg | — | |
| Sodium (as Sodium Citrate) | 60 mg | — | |
| Potassium (as Dipotassium Phosphate) | 20 mg | — | |
| C4 Sport® Performance Blend | 3.181 g | — | |
| C4 Sport® Energy Blend | 1.138 g | — |
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; any remaining comparison concerns the front-label framing.
vision:claude-cli:subscription Amounts are shown as listed panel data, not independently lab-tested contents.
Every check we ran
Confirmed evidence
These checks found support in the public record. They confirm specific facts, not the product as a whole.
USPTO lists Woodbolt Distribution, LLC (LIMITED LIABILITY COMPANY) in DELAWARE, USA for the exact brand wordmark. This identifies the USPTO mark owner or applicant; it does not by itself prove who manufactures or sells this product.
Open Food Facts resolves 810390029198 to "C4 Sport Pre-Workout Blue Raspberry" (C4) — consistent with this listing.
Documented concerns
These are documented contradictions or claims that need more evidence. They are separate from missing data.
Unresolved public record
We looked for these signals but could not settle them from public sources. A gap is not a strike.
The listing presents 135 mg for caffeine, but vision:claude-cli:subscription does not contain a same-name quantified row. The saved image read may be incomplete, so this is a specific question to resolve rather than a contradiction.
Technical check only: the panel’s 8 actives sum to 4,379 mg, which fits inside the ≈7,100 mg serving. This means the numbers are physically possible — it does not mean the formula was validated or the contents confirmed.
30 servings × 7.1 g = 213 g, matching the printed net weight 213 g (NET WT 213g (7.5 OZ)). This checks agreement within the photo read; it is not an independent contents test.
Published sources describe how magnesium 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.
We have not found a public label filing for this exact product. That is a gap in our records, not evidence that no filing exists.
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.
Exact-listing history records written-review counts from 1,231 on 2025-07-02 to 1,328 on 2026-07-22 (net +97). 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
Ask the brand or seller
Answered by the panel: the 0.135 g listing number equals Calcium 25 mg + Magnesium (as Magnesium Chloride) 12 mg + Sodium (as Sodium Citrate) 60 mg + Potassium (as Dipotassium Phosphate) 20 mg. What lot-specific document confirms those listed amounts?
The panel resolves what the headline number includes. The remaining question is whether the product in hand matches those listed amounts; ask for a lot-specific certificate of analysis.
Which specific study supports this claim — and was it run on this exact formula?
Ask for the citation, how many people took part, the dose used, and whether the study tested this product or just one ingredient in it. Ingredient research is not product evidence.
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.
What is the amount of each ingredient inside the proprietary blend?
A blend total tells you nothing about whether any single ingredient reaches a dose used in research. Brands may decline — that answer is informative too.
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
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.
Scan the barcode on the package and confirm it reads 810390029198.
A mismatch between the barcode on the box and the one on the listing is worth pausing over — it can indicate a different variant, a repack, or a counterfeit.
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
| Claim | Status | What we found |
|---|---|---|
| Clinical-evidence claim “…INCREASE REP COUNT - Formulated with CarnoSyn Beta-Alanine, a premium clinically studied beta-alanine, which has been studied to support muscular endurance and fight fat” | No evidence located We looked for: a named, citable clinical study of this product or formula | We found no named, citable study of this product or formula. The claim may rest on ingredient research rather than a trial of this product. |
| Benefit claim “…INCREASE REP COUNT - Formulated with CarnoSyn Beta-Alanine, a premium clinically studied beta-alanine, which has been studied to support muscular endurance and fight fat” | 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
| Ingredient | Where this label sits | Reading |
|---|---|---|
| Magnesium (as Magnesium Chloride) | shaded = doses used in studies (200 mg–420 mg) · bar = this label | 12 mg — below 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
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 — 4 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 | 810390029198 — via source listing UPC |
| Brand | C4 |
| Source listing identifier | B0734F7W6Q |
| Retailer listing title | C4 Sport Pre Workout Powder Blue Raspberry - Pre Workout Energy with C… show full titleC4 Sport Pre Workout Powder Blue Raspberry - Pre Workout Energy with Creatine + 135mg Caffeine and Beta-Alanine Performance Blend - NSF Certified for Sport 30 Servings |
| USPTO brand owner | Woodbolt Distribution, LLC · LIMITED LIABILITY COMPANY · DELAWARE, USA |
| Owner filed address | 332 Grace Lane, Austin, Texas 78746, UNITED STATES |
From the label (photo-read)
| Serving size | Serving Size: 7.1g (Approx. 1 scoop) |
| Servings per container | 30 |
| Net weight | NET WT 213g (7.5 OZ) |
| Pack statement | 30 SERVINGS |
| Badges printed on pack | NSF, NSF CERTIFIED SPORT, NSF Certified for Sport |
Supplement Facts panel (photo-read):
| Ingredient | Amount per serving | Reading confidence |
|---|---|---|
| Calories | 5 | High clearly legible in the photo |
| Total Carbohydrate | 1 g | High clearly legible in the photo |
| Total Sugars | 0 g | High clearly legible in the photo |
| Includes 0g Added Sugars | 0 g | High clearly legible in the photo |
| Vitamin B6 (as Pyridoxine HCl) | 3.4 mg | High clearly legible in the photo |
| Vitamin B12 (as Cyanocobalamin) | 60 mcg | High clearly legible in the photo |
| Calcium | 25 mg | High clearly legible in the photo |
| Magnesium (as Magnesium Chloride) | 12 mg | High clearly legible in the photo |
| Sodium (as Sodium Citrate) | 60 mg | High clearly legible in the photo |
| Potassium (as Dipotassium Phosphate) | 20 mg | High clearly legible in the photo |
| C4 Sport® Performance Blend | 3.181 g | High clearly legible in the photo |
| C4 Sport® Energy Blend | 1.138 g | High clearly legible in the photo |
Claims printed on the packaging:
“#1 GLOBAL PRE-WORKOUT BRAND” · “4TH GENERATION LEGACY SERIES” · “ELEVATED ENERGY” · “MUSCULAR ENDURANCE” · “SUPPORTS HYDRATION” · “BLUE RASPBERRY NATURALLY & ARTIFICIALLY FLAVORED” · “NATURALLY & ARTIFICIALLY FLAVORED” · “EXPLOSIVE ENERGY”
Read by a vision model from 7 listing photos — verbatim extraction; OCR errors possible. Spot a mistake? It will be corrected on review.
Where it sells
| Seller | Price |
|---|---|
| Retailer listing ↗ | $16.45 checked Aug 02, 2026 — varies by variant/session; price history pending |
Reference links for identification only — LookCloser has no affiliate relationships and earns nothing from any link on this page.
Ingredient science — creatine monohydrate · Grade A
Ingredient science — NIH references
Vitamin B6 — NIH ODS · MedlinePlus · PubMed (2,372) · UL 100 mg (adults; chronic high intake linked to neuropathy)
Vitamin B12 — NIH ODS · MedlinePlus · PubMed (5,006) · no UL established
Calcium — NIH ODS · MedlinePlus · PubMed (48,938) · UL 2500 mg (adults 19-50 (2,000 mg for 51+))
Magnesium — NIH ODS · MedlinePlus · PubMed (11,814) · UL 350 mg (SUPPLEMENTAL magnesium only (not from food))
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.
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 810390029198 · built August 02, 2026 · lookcloser.ai · corrections@lookcloser.ai