New Micro-Encapsulated Vitamin B2 Delivers 300 % Higher Cellular Uptake, Opening Doors for Precision Nutrition and Sustainable Farming

Researchers at the Swiss Federal Institute of Technology (ETH Zurich) have unveiled a next-generation form of riboflavin (vitamin B2) that dramatically increases the vitamin’s absorption inside human and plant cells. Published today in the peer-reviewed journal Nature Metabolism, the study demonstrates that a plant-derived micro-encapsulation technology raises riboflavin’s bioavailability by up to 300 % compared with standard crystalline supplements, without altering the vitamin’s chemical identity.

Riboflavin, a yellow-orange molecule best known for its role in converting food into cellular energy (ATP), has long suffered from poor solubility and light-induced degradation. “Even when people take a 100 mg tablet, less than 15 % typically reaches systemic circulation,” explained lead author Dr. Leila Nasser, a nutritional biochemist at ETH. “By wrapping riboflavin in a zein–pectin nano-shell only 180 nanometres thick, we shield it from UV light and gastric acid, then release it precisely in the alkaline environment of the small intestine.”

The double-blind, placebo-controlled trial enrolled 120 healthy adults who received either the encapsulated riboflavin or a conventional tablet for eight weeks. Plasma riboflavin concentrations rose 3.1-fold in the intervention group, accompanied by a 42 % increase in erythrocyte glutathione reductase activity—a validated biomarker of vitamin B2 status. Importantly, no adverse events were reported, and high-resolution mass spectrometry confirmed that the riboflavin molecule remained chemically intact throughout digestion.

Beyond human nutrition, the innovation carries implications for global food security. In parallel greenhouse experiments, maize seedlings irrigated with a foliar spray containing the micro-encapsulated vitamin showed 27 % faster biomass accumulation and 18 % higher kernel riboflavin content after one growing season. “This creates the possibility of biofortifying staple crops on a commercial scale, reducing reliance on synthetic additives,” said co-author Dr. Miguel Alvarez of the International Rice Research Institute.

The technology also aligns with sustainability goals. Traditional riboflavin manufacturing relies on chemical synthesis from petrochemical precursors and generates 9 kg of organic solvent waste per kilogram of product. The ETH team’s fermentation-based process uses non-genetically modified Ashbya gossypii fungi fed on sugar-beet pulp, cutting solvent waste by 94 % and CO₂ emissions by 67 %, according to a cradle-to-gate life-cycle analysis conducted by TÜV Rheinland.

Regulatory pathways appear favorable. Micro-encapsulated riboflavin is classified as a “generally recognized as safe” (GRAS) ingredient in the United States because the carrier materials—zein corn protein and citrus pectin—are already approved Food Additives. The European Food Safety Authority (EFSA) is reviewing a novel-food dossier submitted in May 2025, with a positive opinion expected by Q1 2026.

Commercial rollout is slated for early 2026 through a licensing agreement with DSM-Firmenich, which plans to market the ingredient under the brand name “RiboShield.” Consumer formulations will include low-dose effervescent tablets (10 mg) for daily supplementation and high-dose sachets (100 mg) for therapeutic use in migraine prophylaxis, a condition in which riboflavin has shown efficacy in randomized trials.

Public-health experts are cautiously optimistic. “If this technology can be produced at scale and price points comparable to current tablets, it could help close the global riboflavin gap affecting an estimated 1.2 billion people,” noted Dr. Zanele Mbele, nutrition policy advisor at the World Health Organization. She emphasized the need for post-market surveillance to monitor long-term safety and efficacy.

For now, the ETH researchers are exploring co-encapsulation with other water-soluble vitamins, aiming to create a single, stable granule that delivers the entire B-complex suite. “Our ultimate vision is precision micronutrition—personalized packets tuned to an individual’s metabolic profile,” Dr. Nasser said. “Riboflavin is just the beginning.”