Cambridge Researchers Fortify Shellfish to Combat Global Vitamin Deficiencies

Vitamin deficiencies can lead to severe health issues, and while fortifying food with micronutrients is standard practice, scientists from Cambridge’s Department of Zoology and the local company BioBullets are focused on enhancing bivalve shellfish, including oysters, clams, and mussels, which are already regarded as a healthy protein source.

Dr. David Aldridge and PhD student David Willer have created the world's first microcapsule specifically designed to introduce nutrients beneficial for human health to bivalves. These Vitamin Bullets are engineered for optimal size, buoyancy, and appeal to shellfish.

In a study published today in the journal Frontiers in Nutrition, the team detailed their findings, noting that consuming bivalves means ingesting nutrients that these shellfish absorbed before harvesting, making them ideal for nutritional fortification.

Experimenting in their laboratory, the researchers tested microcapsules fortified with Vitamins A and D on over 100 oysters. They determined the optimal dosages and feeding duration—8 hours towards the end of the “depuration” phase, when bivalves are cleansed after harvest.

Results showed that the fortified oysters contained approximately 100 times more Vitamin A and over 150 times more Vitamin D than natural oysters. Moreover, they outperformed salmon, a widely recognized source of these vitamins, providing more than 26 times the Vitamin A and over four times the Vitamin D found in salmon. A serving of two fortified oysters met the human Recommended Dietary Allowance (RDA) for both vitamins.

Deficiencies in Vitamins A and D present significant public health challenges globally, particularly in regions like Ghana and India where the rates of deficiency are alarmingly high. Over 40% of the U.S. population also suffers from Vitamin D deficiency.

Willer remarked on the potential for this technology to offer an affordable solution to enhance nutrition in sustainable protein sources. He noted that targeted strategies in nutrient-deficient areas could improve public health while minimizing environmental impacts associated with traditional meat production.

Aldridge emphasized their excitement about BioBullets and the ongoing efforts to partner with major seafood manufacturers to improve the sustainability and nutritional quality of seafood. Bivalves provide more protein than beef and contain omega-3 fatty acids and essential minerals but rely on fortification to tackle global deficiencies effectively.

Bivalve aquaculture presents a sustainable option with a lower environmental footprint than conventional meat and many plant crops, offering an affordable food source. Production in China has increased dramatically in recent decades. The researchers assert that consumers in poorer regions may prefer slightly more expensive fortified foods over supplement pills, with fortification adding a minimal cost of $0.0056 to each oyster.

Willer is supported by the Biotechnology and Biological Sciences Research Council, while Aldridge receives support from The University of Cambridge, St Catharine’s College, and Corpus Christi College.