Press Release · March 2026
136 products. 12 analytical categories. Zero brand sponsorships. Every result published.
Products
136
Market Coverage
95%
Test Categories
12
Brand Sponsors
0
Dateline
NATHROP, CO — March 2026 — The Product Report (TPR), an independent consumer product testing lab, today announced the most comprehensive independent shampoo safety study ever conducted in the United States.
The study analyzes 136 shampoo products — representing ~95% of U.S. market coverage — across 12 analytical categories using court-admissible standard methods.
Why this study
In early screening of the first 50 personal care products, our partner lab identified concerning compounds in products sold by some of the largest brands in the country — including arsenous acid derivatives, chloromethane at 23.5% of the volatile profile, and dimethylamine (a nitrosamine precursor) at 67%.
These are screening results, not confirmed findings. ISO 17025 confirmatory testing and manufacturer right of reply are still ahead before results are published.
“Every time you open a bottle of shampoo, you're gambling on what its ingredients actually are.”
— Sheldon Roth, Founder
12 Analytical Categories
Volatile Organic Compounds
EPA SW-846 5021A/8260D
Heavy Metals + Arsenic Speciation
USP ⟨232⟩/⟨233⟩, HPLC-ICP-MS
Benzene
FDA LIB #4674, USP ⟨467⟩
1,4-Dioxane
EPA 8270E SIM
Nitrosamines
EDQM OCCL, LC-MS/MS
PFAS / Forever Chemicals
Total fluorine + LC-MS/MS
Parabens
LC-MS/MS
Phthalates
GC-MS
Formaldehyde & Releasers
DNPH derivatization, HPLC-UV
Fragrance Allergens
EN 16274 / IFRA
Silicones (D4/D5/D6)
ISO 11890-2
Isothiazolinones
HPLC-UV/MS
Study design
Market segments
Mass Market
23Pantene, TRESemmé, Dove, Garnier, Head & Shoulders, Suave
Baby & Family
13Johnson's, Aveeno Baby, Aquaphor, Cetaphil, Honest Company
Salon & Prestige
13Olaplex, Kérastase, Oribe, Redken, Moroccanoil, Pureology
Celebrity & Influencer
14Cécred (Beyoncé), Fenty (Rihanna), LolaVie (Aniston), Pattern (Tracee Ellis Ross)
Men's
14Harry's, Old Spice, Dr. Squatch, American Crew, Axe
Medicated
7Nizoral, Selsun Blue, Neutrogena T/Sal, Denorex
Thinning & Hair Loss
7Nioxin, Rogaine, Nutrafol, Vegamour, Keeps
Clean & Natural
7Briogeo, Dr. Bronner's, Native, Method, Acure
Ethnic & Textured
8Shea Moisture, Mielle, Carol's Daughter, Cantu
EWG Verified
8Innersense, Puracy, Babo Botanicals, Burt's Bees
Store Brands
6Equate, Up&Up, Kirkland, Amazon Basics, Trader Joe's, 365
Dry Shampoos
5Batiste, Dove, Living Proof, Amika
Timeline
Product Acquisition
March 2026
Screening Analysis
Q2 2026
ISO 17025 Confirmation
Q2–Q3 2026
Right of Reply Period
Q3 2026
Results Published
Q3–Q4 2026
Consumer App
Study results will be published in the TPR consumer app. Users can scan a product barcode and instantly see its full lab report — instrument readings, not pass/fail grades.
Members fund studies like this one and receive early access to results as they publish.
Follow this study
This study becomes The Shampoo Drop — screening progress, evidence-tier reports, and member alternatives when results publish. Get notified the day it lands.
See the Shampoo DropAn independent consumer product testing organization based in Colorado. Revenue comes from consumer memberships — no brand sponsorships, paid reviews, or manufacturer funding.
TPR does not make safety claims or provide medical advice. All results are instrument readings from accredited analytical methods.
136 products. 12 analytical categories. Zero brand sponsorships. Every result published.
Products
136
Market Coverage
95%
Test Categories
12
Brand Sponsors
0
Dateline
NATHROP, CO — March 2026 — The Product Report (TPR), an independent consumer product testing lab, today announced the most comprehensive independent shampoo safety study ever conducted in the United States.
The study analyzes 136 shampoo products representing roughly 95% of U.S. market coverage across 12 analytical categories using court-admissible standard methods.
12 Analytical Categories
Volatile Organic Compounds
EPA SW-846 5021A/8260D
Heavy Metals + Arsenic Speciation
USP ⟨232⟩/⟨233⟩, HPLC-ICP-MS
Benzene
FDA LIB #4674, USP ⟨467⟩
1,4-Dioxane
EPA 8270E SIM
Nitrosamines
EDQM OCCL, LC-MS/MS
PFAS / Forever Chemicals
Total fluorine + LC-MS/MS
Parabens
LC-MS/MS
Phthalates
GC-MS
Formaldehyde & Releasers
DNPH derivatization, HPLC-UV
Fragrance Allergens
EN 16274 / IFRA
Silicones (D4/D5/D6)
ISO 11890-2
Isothiazolinones
HPLC-UV/MS
Market Segments
Mass Market
23Pantene, TRESemmé, Dove, Garnier, Head & Shoulders, Suave
Baby & Family
13Johnson's, Aveeno Baby, Aquaphor, Cetaphil, Honest Company
Salon & Prestige
13Olaplex, Kérastase, Oribe, Redken, Moroccanoil, Pureology
Celebrity & Influencer
14Cécred (Beyoncé), Fenty (Rihanna), LolaVie (Aniston), Pattern (Tracee Ellis Ross)
Men's
14Harry's, Old Spice, Dr. Squatch, American Crew, Axe
Medicated
7Nizoral, Selsun Blue, Neutrogena T/Sal, Denorex
Thinning & Hair Loss
7Nioxin, Rogaine, Nutrafol, Vegamour, Keeps
Clean & Natural
7Briogeo, Dr. Bronner's, Native, Method, Acure
Ethnic & Textured
8Shea Moisture, Mielle, Carol's Daughter, Cantu
EWG Verified
8Innersense, Puracy, Babo Botanicals, Burt's Bees
Store Brands
6Equate, Up&Up, Kirkland, Amazon Basics, Trader Joe's, 365
Dry Shampoos
5Batiste, Dove, Living Proof, Amika
Timeline
Product Acquisition
March 2026
Screening Analysis
Q2 2026
ISO 17025 Confirmation
Q2–Q3 2026
Right of Reply Period
Q3 2026
Results Published
Q3–Q4 2026
Follow this study
This study becomes The Shampoo Drop — screening progress, evidence-tier reports, and member alternatives when results publish. Get notified the day it lands.
Consumer App
Study results will be published in the TPR consumer app. Users can scan a product barcode and instantly see its full lab report: instrument readings, not pass/fail grades.
The Product Report is an independent consumer product testing organization based in Colorado. Revenue comes from consumer memberships, with no brand sponsorships, paid reviews, or manufacturer funding.
TPR does not make safety claims or provide medical advice. All results are instrument readings from accredited analytical methods.
