CELADRIN FROM NATURAL FACTORS FOR OPTIMAL JOINT HEALTH. An effective, drug-free formula clinically proven to quickly reduce joint pain and inflammation without side effects. Celadrin from Natural Factors contains a 350 mg proprietary blend of esterified fatty acid carbons (EFAC) which have been proven to promote joint health, improve flexibility and mobility. Celadrin works by lubricating cell membranes helping to promote cell health and integrity, without side effects or contraindications. Ideal for a host joint related problems including sports injuries affecting muscle, tendons and deep tissue, arthritic pain and more.