Chewyz are sold in 100g bags of strawberry, orange and blackcurrant chews. Each chew contains 50mg of omega-3, vitamins A, C, D and E and 35% fibre.
The firm claims the fishy taste that sometimes accompanies omega-3 in products has been eliminated in its confectionery.
The development follows a deal with Lamy Lutti, one of the largest confectionery manufacturers in Europe, in May.
Oxford Nutrascience plans to bring further chews to market next year.
"Healthier confectionery tends to mean sugar free confectionery, but this too often means taste-free confectionery," said Nigel Theobald, boss of Oxford Nutrascience Group. He said the launch of Chewyz marked "a major breakthrough" in tasty, healthy sweets.