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Modelones Builder Gel Clear
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TPO in Nail Products — Uses and Concerns
Editorial review: BuilderGel.app team · Updated · Ingredient-source review, not medical advice
Also known as: Trimethylbenzoyl Diphenylphosphine Oxide, 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide
About TPO
TPO (Trimethylbenzoyl Diphenylphosphine Oxide) is a photoinitiator used in UV/LED curable gel nail products to initiate polymerization upon light exposure. It has been classified as a potential skin sensitizer, and there are concerns about endocrine-disrupting properties. The EU has tightened restrictions on its use in cosmetics. Incomplete curing (under-curing a gel layer) can leave residual unreacted TPO, significantly increasing dermal exposure risk.
Quick Answer
- TPO is a photoinitiator, not a builder gel monomer.
- TPO-free does not mean HEMA-free, and HEMA-free does not mean TPO-free.
- Lamp compatibility and cure time matter because photoinitiators are part of the curing system.
Common product types
UV gel polishbuilder gelBIABtop coatbase coat
Regulatory status
European Commission guidance says TPO-containing cosmetic products are prohibited on the EU market from September 1, 2025 after CMR category 1B classification and inclusion in Annex II of the Cosmetics Regulation.
TPO-Free Alternatives
These products are marked HEMA-free in our database and do not disclose TPO. They are lower-risk starting points, not allergy-proof choices.
No flagged ingredients
Modelones
Modelones Builder Gel Nude Pink
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Amazon customer rating4.6 / 5
As an Amazon Associate, BuilderGel.app earns from qualifying purchases. This purchase link does not affect the disclosure finding.
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Modelones BIAB Builder Gel
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Amazon customer rating4.5 / 5
As an Amazon Associate, BuilderGel.app earns from qualifying purchases. This purchase link does not affect the disclosure finding.
Check Price on AmazonBeetles
Beetles Builder Gel Clear
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Amazon customer rating4.6 / 5
As an Amazon Associate, BuilderGel.app earns from qualifying purchases. This purchase link does not affect the disclosure finding.
Check Price on AmazonFAQ
What is TPO?
TPO (Trimethylbenzoyl Diphenylphosphine Oxide) is a photoinitiator used in UV/LED curable gel nail products to initiate polymerization upon light exposure. It has been classified as a potential skin sensitizer, and there are concerns about endocrine-disrupting properties. The EU has tightened restrictions on its use in cosmetics. Incomplete curing (under-curing a gel layer) can leave residual unreacted TPO, significantly increasing dermal exposure risk.
Why does BuilderGel.app flag TPO?
TPO is classified as medium risk in our system. Photoinitiator used in UV/LED gel systems. Potential sensitizer and endocrine disruptor concern.
What are other names for TPO on ingredient labels?
TPO may also appear as: Trimethylbenzoyl Diphenylphosphine Oxide, 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide.
Sources
Ingredient Disclaimer
This page is educational and does not diagnose allergy. Ingredient labels and formulas can change; verify the current package and ask a healthcare professional if you have symptoms or a known acrylate allergy.