"Greens" supplements are plant-based supplements usually made from ingredients like barley grass, alfalfa, chlorella, spirulina, wheat grass, vegetables, legumes, herbs and even certain varieties of seaweed. Greens food supplements are formulated to complement your daily intake of vitamins, minerals and healthy plant enzymes from whole food sources.
People tend to eat diets very high in meat and dairy, which are very acidic in the body, often throwing of the delicate balance of the body’s acid / alkaline balance. Greens supplements are nutritional powerhouses that have been proposed as a good way to optimize your body's pH, since green foods are very alkaline in terms of pH. These supplements provide many vital nutrients required for basic health but that are usually lacking in the average person’s diet. Furthermore, greens food supplements can bolster immune system function, energy levels, recovery, antioxidant status, and bone health above and beyond what you’d get from whole foods alone.
Remember, though, that greens supplements can help supplement or augment a diet low in fruits and vegetables, but do not make the mistake of assuming they can take the place of whole foods in the diet.