“Biotin 10 mg per serving”
Evidence →The label promises 10 mg per serving. The panel says 10 mg. They match.
Exact product checked · barcode not publishedRainbow Nutrients, LLC · checked Jul 23, 2026 · on sale since Mar 11, 2023Package says manufactured for: Rainbow Nutrients · A 98188
Quick read · Rainbow Nutrients, LLC
Hair Growth Vitamins for Women | Biotin 10,000mcg
Checked against public sources between July 23 and September 1, 2026 · LookCloser does not sell or recommend supplements.
120capsules · 60 servings
Does the marketing hold up?
Ingredient amounts are hidden inside “Proprietary Hair Growth Complex”. The panel lists “Proprietary Hair Growth Complex” (300 mg) as a combined amount. A blend total can’t tell you whether any single ingredient reaches a dose used in research.
Is the dose real?✓Listing and panel agreeboth say 10,000 mcg of Biotin
What a serving costsNo price found for this exact barcode
Is it tested?Claimed — no lab or certificate found
Who’s behind it?No exact match in USPTO
Is it the real thing?No barcode publishedso it can’t be matched against certification, recall or other retailer records
Trouble on record?Recall check not run yeta gap in our records, not a finding about the product
“Couldn’t verify” means we looked and found no public proof — not a mark against the product. Most supplement claims cannot be independently verified by anyone, so grey is the normal state of this industry.
1✓ checked out2◖ partly confirmed2? couldn’t verifyno contradictions · no recalls
The label itself
What the Supplement Facts panel says
| Vitamin A (as Retinyl Palmitate) | 2,700 mcg |
|---|---|
| Vitamin C (Ascorbic Acid) | 100 mg |
| Vitamin D3 (Cholecalciferol) | 2.5 mcg |
| Vitamin E (as D-alpha Tocopheryl Succinate) | 10 mg |
| Thiamin (as Thiamin HCI) | 5 mg |
| Riboflavin | 5 mg |
| Niacin (as Niacinamide) | 5 mg |
| Vitamin B6 (as Pyridoxine HCI) | 5 mg |
| Folate (as 334mcg Folic Acid) | 568 mcg DFE |
| Vitamin B12 (as Cyanocobalamin) | 20 mcg |
| Biotin | 10,000 mcg |
| Pantothenic Acid (as Calcium Pantothenate) | 100 mg |
| Zinc (as Zinc Citrate) | 15 mg |
| OptiMSM® Methylsulfonylmethane (MSM) | 400 mg |
| Hydrolyzed Bovine Collagen | 200 mg |
| Medium Chain Triglycerides | 100 mg |
| Proprietary Hair Growth Complex | 300 mg |
Printed on the package: OptiMSM · NON GMO INGREDIENTS · PROFESSIONAL GRADE · LAB TESTED · MADE IN USA · GMPc FACILITY · goMCT · ZERO ADDED
We read 17 lines from the package photograph. It is our transcript of the label, not the manufacturer’s panel, and it may be incomplete.
Marketing claims, checked
The checks, one by one
1 promise checks out. 4 could not be fully confirmed from public sources.
✓Matches the label1
◐Partly confirmed2
“Formula - Rainbow Nutrients’ Hair Growth is Non-GMO and is made in the USA under strict GMP-certified”
Evidence →“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.
“Supports Stronger & Healthier Hair, Skin and”
Evidence →Published research exists for ingredients in this formula. Whether this product’s doses match those studies could not be confirmed.
Ingredient research can support context, but it is not a trial of this exact product.
?Couldn’t verify independently2
“GMO + Made in”
Evidence →“Made in USA” can describe only final bottling. Ingredient-sourcing records were not located for this product.
“these premium quality ingredients are 3rd party tested and blended into one powerful supplement to help give you the results you”
Evidence →No named laboratory or lot-specific certificate was found for this exact product. A related brand page names no testing issuer and links no product-bound report; its UPC is not published. NSF, 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.
We looked and found no public proof. That does not count against the product.
Quick read · 1 useful finding
What is worth knowing.
Headlines first. Open evidence only when you want the source trail.
CheckedIs the label honest?
Listing claim matches the Supplement Facts panel
The label promise and the Supplement Facts amount agree.
Evidence and sources
The listing claims 10 mg; the photo-read Supplement Facts panel shows Biotin at 10 mg per serving — the listing text and its photo-read panel agree; this is internal consistency, not independent testing.
Locked evidence record →Open the full source-linked findingWhat remains open 1
- Brand ownership is not settled in this record.
These are evidence gaps, not strikes against the product.
Research behind the findings
Dose and research context
We could not match an amount on this product to a studied range for the same ingredient, so these links are ingredient background rather than a measurement of this product.
Background reading
What the research says about these amounts
Not a score. Studies disagree with each other and change over time, so this sits beside the evidence rather than counting toward it — it is here so you can read the sources yourself.
The panel lists 200 mg of collagen peptides per serving. Studies we found used 2.5 g–15 g a day, so this sits below that range.
0studied 2.5 g–15 g
Study ranges differ between trials and change as research changes. This is background reading, not a pass, a failure, or a recommendation.
The panel lists 15 mg of zinc per serving. Studies we found used 8 mg–40 mg a day, so this sits inside that range.
0studied 8 mg–40 mg
Study ranges differ between trials and change as research changes. This is background reading, not a pass, a failure, or a recommendation.
Buying options
Where you can check or buy it
Open related seller leads before buying, then confirm the flavor, count, and serving size. Their prices are visible, but LookCloser does not claim savings until the pages share a UPC/GTIN.
Amazon
Submitted listing$29.95
Lowest New observed via Keepa on 2026-08-29.
View on Amazon ↗Brand website
Official product-page candidate · UPC absent$24.91
Useful official shopping lead; excluded from exact price comparisons.
Advanced Hair Growth for Women · 60ct Bottle. The page matches the same named product, but omits the identifier needed to bind the exact sellable unit.
Check brand website ↗iHerb
Not confirmedNo price confirmed
No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.
Search iHerb ↗Target
Not confirmedNo price confirmed
No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.
Search Target ↗Walmart
Not confirmedNo price confirmed
No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.
Search Walmart ↗Related brand page publishes a review aggregate
The related page's review pool may differ from the observed listing. Because the page does not publish a matching UPC/GTIN, LookCloser does not attribute that review aggregate to this exact sellable unit.
Prices and stock are point-in-time observations. Related pages are never used as product evidence. No affiliate links; LookCloser earns nothing from these sellers.
Want to inspect the evidence?
The full report shows every source, the exact unresolved question, and the documentation that would settle it.
Record built September 03, 2026. Sources: source listing observed at check time · USPTO Trademark Search · Keepa exact-listing history · NIH / published research · certification and regulator records where available. LookCloser publishes evidence and gaps; it does not advise for or against any supplement. Evidence-based corrections welcome.