Which brands contain diacetyl in their vape juices?

Based on this issue, no specific vape juice brands are explicitly named as containing diacetyl, but key findings and industry practices can be summarized:

Widespread Presence in Flavored E-liquids:
A 2015 Harvard study tested 51 popular flavored e-liquids and found 76% (39 out of 51 brands) contained diacetyl, especially in dessert, fruit, and candy flavors. However, the study did not disclose specific brand names.

J Well's Diacetyl-Free Claim:
French brand J Well explicitly prohibits diacetyl in its e-liquids. They use ISO 22000-certified French flavor suppliers and adhere to AFNOR standards and "Origine France Garantie" certification to exclude this compound.

Hangsen E-liquids' Testing Results:
Analyses commissioned by the French retailer "Vapers Corner" detected diacetyl and acetyl propionyl in Hangsen (branded as "Pharmacien Secret") e-liquids. Quantities were within the 22 ppm safety threshold proposed by some industry experts, but the presence was confirmed.

Regulatory Differences:

Europe: Diacetyl is banned in e-liquids under EU regulations (e.g., TPD certification).

United States & Asia: No explicit bans exist, leading to potential use in e-liquids from these regions. For example, U.S.-targeted products were flagged in the Harvard study.

Consumer Guidance:

Avoid cream, custard, or dessert-flavored e-liquids, as diacetyl is commonly used in these profiles.

Prioritize brands that publish third-party lab reports (e.g., COA testing) verifying diacetyl-free status, as seen with European manufacturers.

Key Takeaway:

While brands like J Well actively exclude diacetyl, its prevalence in sweet-flavored products-especially from less regulated markets-remains high. Consumers should verify lab reports or choose EU-compliant products to minimize exposure. For specific brand-related data, direct laboratory testing or regulatory disclosures are recommended.