Inclusion Criteria:  Characteristic joint pain indicating osteoarthritis (OA) in the hip(s) or knee(s). A radiologically and clinically verified diagnosis of mild to moderate OA graded 1-3 on a Kellgren-Lawrence (KL) grading scale in affected hips or knees. Age 18-70 years. Familiar with the Norwegian language, both in writing and orally. Willingness to participate in the study.  Exclusion Criteria:  A radiologically and clinically verified diagnosis of severe OA graded 4 on a KL grading scale in affected hips or knees. Use of drugs (and supplements) known to influence bone and joint metabolism. Pregnancy or breastfeeding Known fish allergy and history of hypersensitivity to any of the components in the interventional product. Other reasons in which the principal investigator deems it necessary to exclude a potential participant.