Now suppose that light in the yellow range of wavelengths (approximately 577 nm to 597 nm) enters the eye and strikes the retina. Light with these wavelengths would activate both the green and the red cones of the retina.
Brewer's yeast is a kind of yeast that is a by-product of brewing beer. Dietary supplements containing brewer's yeast often contain non-living, dried yeast. People use brewerâs yeast to make medicine. Brewer's yeast is used for diarrhea, the common cold and other upper respiratory tract infections, influenza, swine flu, loss of appetite, acne, premenstrual syndrome (PMS), recurring boils on the skin (furunculosis), and type 2 diabetes. It has also been used as a source of B vitamins, chromium, and protein.
The side effects of brewerâs yeast are generally mild. The most common side effects are excess gas, bloating, and migraine-like headaches. Stop taking brewerâs yeast and contact your healthcare provider immediately if you experience chest pain, throat or chest tightness, or difficulty breathing. These side effects may indicate an allergic reaction to brewerâs yeast. Brewerâs yeast is a source of B vitamins but it does not contain B-12.