Chlorella has been touted as the perfect whole food. Aside from being a complete protein and containing all the B vitamins, vitamin C, vitamin E, and the major minerals (with zinc and iron in amounts large enough to be considered supplementary), it has been found to improve the immune system, improve digestion, detoxify the body, accelerate healing, protect against radiation, aid in the prevention of degenerative diseases, help in treatment of Candida albicans, relieve arthritis pain and, because of its nutritional content, aid in the success of numerous weight loss programs.
– Earl Mindell’s Vitamin Bible

Chlorella is a tiny, single-celled water-grown alga containing a nucleus and an enormous amount of readily available chlorophyll. It also contains protein (approximately 58 percent), carbohydrates, all of the B vitamins, vitamins C and E, amino acids, and rare trace minerals. In fact, it is virtually a complete food. It contains more vitamin B12 than liver does, plus a considerable amount of beta-carotene.
– A-to-Z Guide To Supplements, James F. Balch M.D.

Spirulina:

• A better source of edible protein. Has 12 times the protein of beef. Great for athletes and bodybuilders.

• Gentler on the gastrointestinal system than chlorella, which can induce diarrhea in some people.

• The finest source of gamma-linolenic acid (GLA), a “good” fat indispensable for the brain, healthy heart function, nerves, etc.

• Contains phycocyanin, a powerful phytochemical that fights cancer.

• 300% more calcium than whole milk

• 2300% more iron than spinach

• 3900% more beta carotene than carrots

• 375% more protein than tofu

• Three grams of Spirulina have more antioxidant and anti-inflammatory

activity than five servings of vegetables

• Comparing phytonutrient levels, Spirulina is 31 times more

potent than blueberries, 60 times more potent than spinach and

700 times more potent than apples

Spirulina’s predigested protein provides building material soon after ingestion, without the energy-draining side effects of meat protein; its mucopolysaccharides relax and strengthen connective tissue while reducing the possibility of inflammation; its simple carbohydrates yield immediate yet sustained energy; its GLA fatty acids improve hormonal balance; and its protein-bonded vitamins and minerals, as found in all whole foods, assimilate better than the synthetic variety. Spirulina can generally be considered an appropriate food for those who exercise vigorously, as evidenced by the many world-class athletes who use it.
– Healing With Whole Foods by Paul Pitchford

Spirulina is the world’s most digestible natural source of high quality protein, far surpassing the protein bioavailability of beef (which most people consider to be the #1 source of protein). The digestive absorption of each gram of protein in spirulina is four times greater than the same gram of protein in beef. And since spirulina already contains three times more protein (by weight) to begin with, the net result is that, ounce for ounce, spirulina offers twelve times more digestible protein than beef. That’s an astounding difference. It means that spirulina is the ideal food source for people working to get more protein into their diets.
– Superfoods for Optimal Health by Mike Adams

Chlorella and spirulina both supply a large array of benefits, and a lot of their capabilities intersect. Therefore people should take both in considerable amounts. Generally speaking, people should consume 2 grams of spirulina for every 1 gram of chlorella.

Chlorella & Spirulina for Proper pH Balance

Almost all of us ingest diets that are much too acidic. Most processed foods — produced with sugars, white flour, and other unhealthy substances — are acidic. Soft drinks and most refined fruit drinks are particularly acidic. When habitually consumed, these acidulous foods create a pH imbalance in the body.

pH equilibrium is vital for our well-being. The pH of your blood must be maintained at a specific level of about 7. Pure water is said to be neutral. The pH for pure water at 25 °C (77 °F) is close to 7. Solutions with a pH less than 7 are said to be acidic  and solutions with a pH greater than 7 are said to be basic or alkaline. Eating acidic foods and beverages corrupts the pH balance in the body, forcing the body to react in ways that negatively impact our health, such as chronic inflammation of body tissue.

One strategy that the body employs to rid itself of acidity and restore pH balance is to extract calcium from our bones. Calcium is a wonderful pH balancer. The problem is that over time this depletes our bodies store of calcium, and then we are in serious trouble. Depleted calcium can be a cause of everything from osteoporosis to cancer. It is no wonder that calcium has been shown to treat both of these diseases quite effectively.

Spirulina and chlorella provide an effective solution to the pH imbalances of most diets because they are alkaline foods that counter acid-forming foods and elevate pH levels back towards alkalinity. This elevates bone mass (by keeping calcium in the bones), and greatly enhances metabolic functions. Ingesting alkaline foods  improves immune system function, mental function, kidney function, increases energy and the overall function of the body.

High-protein / low-carb diets are  extremely acidic because meat is acidic. By substituting some meat with protein from spirulina, overall pH balance can be greatly improved.

Chlorella & Spirulina for Preventing & Reversing Cancer

Chlorella and spirulina possess extraordinary cancer fighting powers.

Chlorella is a one-cell blue-green alga that is highly nutritive as a food and also stimulates the immune system. It increases macrophage activity and has shown antitumor effects. Chorellan is a substance found in chlorella that stimulates interferon production. There are several papers on the prevention and/or inhibition of cancer using chlorella as well as documentation of its DNA repair mechanism. Of all the super green foods, chlorella is the one that impresses me the most.
– Herbal Medicine, Healing & Cancer by Donald R. Yance