Concerning vitamin C deficiency, there are many low-light plants that contain an abundance of vitamin C. In fact, I'd be hard pressed to find a plant that didn't contain it. I spent time in the jungles of Panama, and believe it or not, sometimes the natural canopy was so thick, sunlight was rarely seen! Plantain, mango and almost all tropical plants survive quite nicely without the benefit of direct sunlight. Garcinia cambogia contains more vitamin C than any other plant thus far found.
The hardy antioxidant herbs, garlic and echinacea are also good choices and should be included in a practical herb garden - even a hydroponic one. I believe that kelp, algae, mushrooms, moss and other plants can more than supply the vitamin C levels that humanity needs. Alfalfa is a plant that sometimes can grow down to 40 feet in the earth, extracting vitamins and minerals other plants cannot reach.
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