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Glutathione can not only be used as medicine, but also as the base material of functional food, which is widely used in functional food such as delaying aging, enhancing immunity and anti-tumor
Both of these kefir grains share similar characteristics in that they are reusable for successive fermentation, and the biomass will increase in every cycle of production, but the yield may vary with fermentation variables (Guzel-Seydim et al., 2011)
PLoS ONE 7 , e40074 (2012)
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