In the United States and all other industrial nations, sulfur is a critical raw material. It is used in thousands of products and processes. Sulfur is yellow in color and similar to oxygen in its chemical behavior. Sulfur burns readily with a blue flame, which earned its name brimstone, or burning stone. Sulfur is one of the elements necessary to life. It is found in many animals and vegetable substances, especially proteins. The bad smell of rotten egg is due to hydrogen sulfide. It is the sulfur in eggs that tarnishes silver so quickly, forming the black compound silver sulfide. Cauliflower and other members of the cabbage family are particularly rich in sulfur, as are such animal s substances as hair. The fact that sulfur burns so readily accounts for its use in matches, gunpowder, and fireworks. Sulfur candles are used to kill vermin. Bordeaux mixture, a standard insecticide, contains copper sulfate. In addition, many preparations used to prevent fungus diseases are made with sulfur. Sulfur ranks 16th in abundance among the elements in the earths crust and it is found widely distributed in both the free and combined states. Sulfur exists in nature both in its native, uncombined form and in compounds. A large proportion of the world s native sulfur occurs in the salt domes of the Gulf region of the southern United States. There are also large volcanic deposits of sulfur in Sicily. Sulfur can be extracted commercially from pyrites. This is a mixture of several sulfur compounds, including the mineral pyrite, or iron sulfide.Sulfur dioxide is a colorless gas with a pungent odor. It will become liquid form when under pressure (heat) and will dissolve in water very fast or easily. The primary sources of sulfur dioxide comes mainly from some activities such as burning of fossil fuel to provide electric power, process of making steel, coal-burning and others. However, it can also be released from the natural volcanic activity or volcanic eruption to the air. This gaseous material can easily pose a threat to the living things such as humans, animals and plants. Sulfur is present in all living tissues and it is a component of amino acids which functions as the building blocks of the body. In fact, nearly half of sulfur is concentrated in our skin, bones and muscle tissues. When there is too little sulfur in our body, it can lead to many health problems.MacLeod et al. (1961) confirmed that when the entry rate is low, sulfur ions can enter the metabolic pathways of plants normally without any distinct injury or symptom on the leaves. However, if the amount of sulfur ions exceeds the ‘normal’ quantities in the plant requirement enters, it can affect the metabolism of plants or the characteristics of chronic injury (yellowing) to the plants will develop no matter how slowly the sulfur enters the plants. But when the sulfur enters the plants rapidly, the metabolic systems of plants for coping with sulfur will be overwhelmed and it can cause the acute injury (bifacial intercostals necrosis).Sulfur may enter the plants in few ways such as enter through the roots in form of sulphate ion, dissolved in water with form of sulphate ion or in form of gaseous sulfur dioxide (SO2) which can penetrates into the leaves through the stomata. But both of it can be utilized by plants through the metabolism of normal sulfur, although the limited pathway via cuticle was proof. However, the aperture of the stomata was largely controlled by conditions of the environment, such as temperature, ligh, etc.So why do we need Sulfur daily? Did you know that of the 20 amino acids present in food, only 2 contain sulfur, and neither are stored in your body? One of these amino acids, Methionine, cannot be synthesized by our body and therefore has to be supplied from outside sources. Cysteine, another sulfur containing amino acid, is synthesized by our body but needs a steady supply of sulfur in order to do so.These amino acids are not normally stored in the body and excess amounts are either eliminated through the urine or in the feces or stored in the form of glutathione. Glutathione is one of the most potent antioxidants in the body. It has the ability to neutralize free radicals and to detoxify poisonous compounds. Our body uses up to 750 mg of organic sulfur daily, so we must consume foods containing sulfur everyday to keep our body functioning at its peak performance.Excellent sources of sulfur are organic broccoli, cabbage, cauliflower, Bok choy, kale, Brussel sprouts, turnips, kohlrabi, edamame beans, sweet corn, peas, spinach, mustard greens, bamboo shoots, asparagus, okra, lettuce, and eggplant.