Ethical Naturals Inc. (ENI), San Anselmo, CA, has been granted a U.S. patent for its method of testing and identifying the unique markers that differentiate between shellfish and vegetable based glucosamine. This new analytical technique is hugely significant from a commercial standpoint because shellfish glucosamine is generally more readily available, cheaper to produce, and can easily be substituted for the value added vegetable material.   A verified pure source, such as ENI’s GreenGrown vegetable glucosamine is particularly important in order to comply with label claims for proper ingredient sources.