SPF Testing and Formula Details for Light Moisturizing Sunscreen (UK Branding)

Question

Hi hope you are well.

I would like to check if the manufacturer actually did SPF testing to substantiate claims for Light Moisturizing Sunscreen (SPF50+, PA++++, Compare to Beauty of Joseon) or if the testing would need to be performed by me if I would like to sell it under my brand in the UK.

Also, the laboratory was asking for formula percentages; would it be possible to obtain this?

Many thanks

Answer 1

Regarding your inquiry about the Light Moisturizing Sunscreen (SPF50+, PA++++, Compare to Beauty of Joseon), here is the technical breakdown concerning testing, UK regulations, and formula details.

1. Manufacturer SPF Testing

The manufacturer has conducted internal testing to confirm that this formulation achieves a minimum of SPF50+ and PA++++. This product is designed as a high-performance base for customization or private labeling.

2. Selling Under Your Brand in the UK

To sell this product under your own brand in the UK, you must comply with the UK Cosmetics Regulation (Schedule 34 of the Product Safety and Metrology etc. Amendment etc. (EU Exit) Regulations 2019).

Responsible Person (RP): By rebranding the product, you (or your company) typically become the "Responsible Person" in the UK. This means you are legally liable for the product's safety and compliance.
Product Information File (PIF): You must maintain a PIF for the product, which includes the Cosmetic Product Safety Report (CPSR) and evidence of the claimed effects (SPF/PA).
Substantiating Claims: While you can potentially rely on the manufacturer's test report, it must be for the identical finished product. If you add any ingredients (fragrance, extracts, etc.), the SPF value may change, and you would likely need to perform new testing.
Testing Standards: For the UK market, simple UV-Vis spectrophotometry is generally considered a screening tool. For official SPF50+ label claims, ISO 24444 (in-vivo) or a validated equivalent recognized by safety assessors is the industry standard.

3. Formula Percentages

The following quantitative data is available for this formulation to assist your laboratory or safety assessor:

Ingredient	Percentage (%)
Dibutyl Adipate	10.0%
Propanediol	5.0%
Diethylamino Hydroxybenzoyl Hexyl Benzoate	2.0%
Polymethylsilsesquioxane	2.0%
Ethylhexyl Triazone	2.0%
Methylene Bis-Benzotriazolyl Tetramethylbutylphenol	2.0%
Coco-Caprylate/Caprate	2.0%
Caprylyl Methicone	2.0%
Diethylhexyl Butamido Triazone	2.0%
Glycerin	2.0%
Butylene Glycol	2.0%
Pentylene Glycol	2.0%
Poly C10-30 Alkyl Acrylate	1.0%
Polyglyceryl-3 Methylglucose Distearate	1.0%
Decyl Glucoside	1.0%
Acrylates/C10-30 Alkyl Acrylate Crosspolymer	1.0%
Sodium Stearoyl Glutamate	0.5%

Note: The remainder of the formula consists of Water, Tromethamine, Carbomer, 1,2-Hexanediol, Phenoxyethanol, and Chlorphenesin.*

Recommendations

Request Documentation: Ask the supplier for the full compliance package, including the SPF/PA test report, stability data, and a GMP statement.
Safety Assessment: Provide the full quantitative formula to a UK-qualified safety assessor to initiate your CPSR.
Screening: If you modify the base, you may use UV-Vis screening as a cost-effective first step before proceeding to full ISO certification.