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Instaflex® is a leading health and active lifestyle brand. All of our products feature proprietary formulas that have been carefully researched and crafted with the highest quality ingredients. Learn about or purchase our products online or at any GNC store nationwide.

Doctor Katz

Doctor Formulated

The newest breakthrough for the Instaflex® line is called Instaflex® Advanced, doctor-formulated with renowned medical expert Dr. David Katz to provide fast, powerful joint relief.

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