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. Uses. Brewer's yeast is traditionally used as a source of vitamin B, selenium, and chromium, especially by vegetarians. Clinical trials have evaluated yeast for a role in immunomodulation, respiratory infections, prevention of postsurgical infections (as beta-glucan), and as a source of dietary fiber to improve the lipid profile.
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.