Hong Kong’s Consumer Council reveals alarming findings in 28 popular butter, margarine, and spread products, with one sample exceeding EU safety limits for a cancer-causing chemical and over half containing potential endocrine disruptors.
In a comprehensive investigation published in its May 2025 issue of Choice magazine (Issue 551), the Consumer Council tested 28 common pre-packaged butter, margarine, and spread products available in Hong Kong markets. The study analyzed contaminants, various fatty acid profiles, and sodium levels, uncovering significant variations across brands. The results have raised red flags: one product contained a carcinogen above the European Union’s maximum threshold, while nearly two-thirds of samples were tainted with plasticizers.
Carcinogen Contamination Found in Multiple Products
The most concerning discovery involved benzo[a]pyrene, a chemical classified by the World Health Organization as a Group 1 carcinogen—meaning it is known to cause cancer in humans. One sample, Snow Brand Premium Vegetable Butter, tested at 0.8 micrograms per kilogram. Although this falls below Hong Kong’s current safety limit of 10 mcg/kg, it exceeds the stricter EU standard of 2 mcg/kg. Notably, Hong Kong’s own regulations are tightening: a new limit of 5 mcg/kg takes effect on June 1, 2023.
Even more prevalent was glycidol, a processing contaminant found in 15 out of 16 samples containing vegetable oils. Concentrations ranged from 60 to 1,500 mcg per kilogram. The worst offender—Earth Balance Original Buttery Spread—exceeded the EU’s maximum limit of 1,000 mcg/kg. Only one vegetable oil-based product, Daisy Butter Blend Spread (Salted), was completely free of glycidol.
Plasticizers Detected in 60% of Butter Samples
The testing revealed that over 60% of the 28 samples contained phthalates, a class of plasticizers commonly used in food production and packaging. Research indicates that long-term ingestion of these compounds may disrupt the endocrine system, potentially affecting reproductive development and organ function. However, the levels detected in this study were all within safe limits, meaning typical consumption does not pose an immediate health risk.
Wide Nutritional Disparities Across Brands
The analysis highlighted stark differences in fatty acid composition and sodium content. Butter samples averaged 82.1 grams of total fat, 46.0 grams of saturated fat, and 3.5 grams of trans fat per 100 grams. In contrast, margarine and spread products contained significantly lower levels: total fat ranging from 47.6 to 77.6 grams, saturated fat from 9.5 to 32.5 grams, and trans fat from undetectable to 0.31 grams per 100 grams. Spreads also displayed the widest variation among themselves.
Top-Rated Products: Two Spreads Earn 5-Star Rating
Only two products achieved the highest 5-star rating from the Consumer Council: Flora Light Spread and Meadows Spread with Sunflower Oil. These products were commended for their lower levels of contaminants and healthier fatty acid profiles.
Expert Safety Tips for Consumers
The Consumer Council offers seven practical recommendations for safer consumption of butter, margarine, and spreads:
- Limit intake – All such products are high in fat. Maintain a balanced diet and regular exercise.
- Read labels carefully – Compare saturated fat, trans fat, and unsaturated fat content. Spreads show the greatest variation, so choose wisely.
- Check packaging – Ensure seals are intact and note expiration dates before purchasing.
- Store properly – Unopened products should follow package instructions. Once opened, refrigerate and consume within the recommended period.
- Avoid cooking with spreads – These products are not designed for high-heat applications.
- Prioritize lower contaminants – When selecting spreads, opt for brands with minimal pollutant levels.
- Beware of fat content – While spreads contain less total and saturated fat than butter, they may still harbor processing contaminants like 3-MCPD and glycidol.
Broader Implications for Hong Kong Consumers
This investigation serves as a critical reminder that not all fats are created equal. The Consumer Council’s findings underscore the importance of informed shopping, especially as regulatory standards evolve. With Hong Kong’s new benzo[a]pyrene limit taking effect soon, manufacturers will need to tighten quality controls. For now, consumers are urged to scrutinize nutrition labels, choose products with higher unsaturated fat ratios, and remain vigilant about contaminant levels.
For the full list of tested products and detailed results, readers can refer to the Consumer Council’s Choice magazine Issue 551 or visit their official website. Remember: product prices and formulations may change, so always check current labels before purchase.