Investigation Finds High-Strength Omega-3 Supplements May Not Deliver Potency Advertised

Some omega-3 supplements marketed as 'high-strength' may not offer superior potency compared to less expensive alternatives, according to an investigation by consumer group Which?. The inquiry found that certain higher-priced products contained less of the active omega-3 fatty acids, EPA and DHA, than the recommended daily intake, and sometimes less than cheaper, non-'high-strength' options.

Which? assessed 24 omega-3 supplements against guidance from the Scientific Advisory Committee on Nutrition (SACN), which suggests an average daily intake of 450mg of EPA and DHA. For products marketed as 'high-strength', Which? used 1,000mg of EPA and DHA as a benchmark, based on studies showing health benefits at this level for specific groups. However, the investigation revealed that several 'high-strength' products fell short of this benchmark and even the general daily guidance.

The consumer group identified specific examples, including Superdrug, Morrisons, and Sainsbury's Omega 3 Fish Oil 1000mg supplements, each containing only 250mg of combined EPA and DHA despite their 'high strength' labeling. Sainsbury's product, at 14p per dose, was double the price of nutritionally similar, non-high-strength products from Asda and Tesco. Holland & Barrett's High Strength Omega 3 Fish Oil 1500mg reportedly contained just 375mg of EPA and DHA, significantly below the 450mg daily advised dose. This product cost 27p per daily dose, while its standard pack, offering only 75mg less active ingredient, cost 22p per dose.

Retailers' responses indicated that their labeling complies with the Nutrition and Health Claims Regulation (EC) No. 1924/2006, which permits an 'omega-3' claim if a product contains at least 80mg of combined EPA and DHA. Superdrug stated that its 250mg product met this criterion, making the 'High Strength' description appropriate. Morrisons and Sainsbury's echoed these sentiments, confirming their products adhere to labeling regulations and contain the stated amounts.

A Holland & Barrett spokeswoman clarified that 'high strength' is used internally to help customers differentiate between products within their range, rather than indicating compliance with an external standard. She added that product details are clearly displayed for informed consumer choice.

In contrast, the investigation found brands such as Nutravita, Weightworld, and Zipvit offered at least 1,000mg of EPA and DHA for less than 20p per dose. Which? noted that supplement packaging often prominently displays the total amount of fish oil, while the crucial EPA and DHA content is relegated to smaller print on the back. Which? advised shoppers to check the back of the packaging for the combined EPA and DHA content to ensure they are purchasing supplements that meet their needs and offer good value for money.