Guardion Health Sciences, Inc., together with its subsidiaries, operates as a specialty health sciences company in the United States. It operates in two segments, Medical Foods and Nutraceuticals, and Medical Devices. The company offers Lumega-Z, a medical food that replenishes and restores the macular protective pigment; and GlaucoCetin, a vision-specific medical food to support and protect the mitochondrial function of optic nerve cells, as well as improve blood flow in the ophthalmic artery in patients with glaucoma.