Benefits
Joint function
In one small 68 day trial of 64 adults, a generic cetylated fatty acid product improved knee flexion and Lequesne function scores versus placebo. This is the only controlled trial, and it did not test the Estraflex brand.
Joint comfort and mobility
The single knee osteoarthritis trial measured a gain in range of motion and daily function. No other controlled trial has confirmed this, and none used the Estraflex brand.
Joint lubrication
Lubrication is a proposed mechanism only. No human study has measured joint lubrication or joint fluid quality with cetylated fatty acids.
Mechanism of action
Membrane and lubrication support
Cetylated fatty acids incorporate into cell membranes and joint tissue, where they are thought to improve lubrication and reduce friction.
Anti-inflammatory action
The cetylated esters appear to calm inflammatory signaling within the joint, easing discomfort.
Clinical trials
Randomized controlled trial of cetylated fatty acids on knee function in osteoarthritis. (Hesslink et al. 2002, Journal of Rheumatology)
Adults with knee osteoarthritis.
In 64 adults, a cetylated fatty acid product (Celadrin, not the Estraflex brand) improved knee flexion (10.1 vs 1.1 degrees) and Lequesne function scores versus placebo over 68 days.