In a recent investigation that has sent ripples through the local health-food community, the Hong Kong Consumer Council revealed that every dried goji berry sample tested in its latest study contained trace amounts of heavy metals. The watchdog analyzed 27 varieties of the popular “superfood” collected from supermarkets, pharmacies, and specialty retailers across the city. While goji berries are prized in traditional medicine for their antioxidant properties, the findings highlight significant concerns regarding agricultural contamination, with over 70% of the products also testing positive for pesticide residues.
The study, featured in the Council’s Choice magazine, examined 23 pre-packaged and four loose-bulk samples ranging in price from $9.0 to $64.3 per 100 grams. Despite the premium pricing on some items, cost did not equate to absolute purity. Lead was detected in 21 samples, with two specific brands—Shang Pin and Yu Pin King—showing lead concentrations that approached the maximum legal limits set by Hong Kong’s Food Adulteration (Metallic Contamination) Regulations.
The Risks of “Cocktail” Contamination
Beyond lead, the laboratory tests identified cadmium in every single sample, along with traces of arsenic and chromium in several others. While the heavy metal levels generally remained within legal bounds, the Consumer Council raised the alarm over the presence of pesticides. Nineteen samples contained residues of at least 14 different chemicals.
Of particular concern was the “cocktail effect” found in high-complexity samples. One brand, Hart, was found to contain seven different types of pesticides, while others like Tung Fong Hung and CR Care contained five. Health experts warn that while individual pesticide levels might be low, the cumulative impact of multiple chemicals can lead to unpredictable health interactions. Notably, two samples exceeded the stringent residue limits set by the European Food Safety Authority (EFSA), though they still complied with more lenient local standards.
Safety Guidelines for Consumers
Despite these findings, the report offered some reassurance. None of the tested berries contained illegal food dyes or dangerous mycotoxins like aflatoxin. For most adults, the risk of acute toxicity remains low; for instance, a 60kg adult would need to consume over 17kg of the most affected berries in a single day to reach dangerous intake levels. However, long-term exposure to lead is particularly hazardous for children, as it can impair neurological development and cognitive growth.
To minimize risk, the Consumer Council recommends that shoppers look for high-rated products that prioritize organic sourcing. The following brands achieved a superior 4.5-star rating for quality and safety:
- Wai Yuen Tong (Organic Ingredients)
- Sunfood Super Foods
- Dot Dot Green (Organic Premium)
- Livi Green (Organic Ready-to-eat)
- Slowood (Organic)
Consumers are advised to thoroughly wash dried goji berries under running water or soak them briefly before consumption to help remove surface residues. While these nutrient-dense berries remain a staple of the Hong Kong diet, choosing reputable, highly-rated brands is essential for balancing health benefits with food safety.