Small silver particle size (average 1-3 nanometers) colloidal silver for maximum bioavailability - gluten free & non-GMO Made using silver in its most natural form - true amber color - provides superior immune support 250ppm higher strength liquid formulas packaged in amber glass bottles for optimal quality & integrity Independent lab tested verifying ultra fine pharmaceutical grade colloidal silver particle size, purity, PPM, stability, and pH accuracy The original family-owned and multi-award winning colloidal silver experts in the U.S., also creating herbal blend formulas & skincare products since 1994 Silver Wings supports various charities and humanitarian organizations including the Autism Hope Alliance Natural Path Silver Wings colloidal silver 250ppm is a liquid mineral dietary immune support supplement. The oldest family-owned and operated colloidal silver manufacturer in the U.S. and winner of multiple “best supplement” awards. Natural Path Silver Wings pharmaceutical grade colloidal silver has a true amber color, as nature intended, which demonstrates the higher parts per million (ppm). The higher the ppm (more silver particles per serving), the darker the amber color. The virtually tasteless liquid is available in either spray or dropper bottles. It's gluten free , non-GMO, and suspended in pure, pharmaceutical grade deionized water within amber colored glass bottles to ensure the quality and integrity. Formulated by doctors and medical professionals, it's 25x more silver particles than other brands with only 10ppm.