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Glutathione (GSH) is an important antioxidant in plants, animals, fungi, and some bacteria and archaea. Glutathione is capable of preventing damage to important cellular components caused by reactive oxygen species such as free radicals, peroxides, lipid peroxides, and heavy metals.It is a tripeptide with a gamma peptide linkage between the carboxyl group of the glutamate side chain and the amine group of cysteine, and the carboxyl group of cysteine is attached by normal peptide linkage to a glycine.
Thiol groups are reducing agents, existing at a concentration around 5 mM in animal cells. Glutathione reduces disulfide bonds formed within cytoplasmic proteins to cysteines by serving as an electron donor. In the process, glutathione is converted to its oxidized form, glutathione disulfide (GSSG), also called L-(-)-glutathione.
Once oxidized, glutathione can be reduced back by glutathione reductase, using NADPH as an electron donor.The ratio of reduced glutathione to oxidized glutathione within cells is often used as a measure of cellular oxidative stress.

Glutathione (-L-Glutamyl-L-cysteinylglycine) is a small amino acid containing molecule (peptide) comprised of one molecule of L-glutamic acid, L-cysteine, and Glycine each. The molecule is found in the food supply and in the human body where it acts as an antioxidant. The 'glutathione system' comprises the enzymes that synthesize glutathione within a cell as well as dedicated enzymes that use glutathione as the means to exert antioxidant effects. Supplementation of glutathione is thought to support this pool of glutathione in a cell and thus maintain the efficacy of the entire glutathione system. Despite the pervasive role of glutathione in cell biology, it currently has a limited role in nutritional supplementation due to the following pharmacokinetic properties:

There may be some absorption of glutathione intact from the intestines, but it cannot enter cells intact. It must be metabolized to form L-cystine (two molecules of L-cysteine bound together) before being taken up.
Provision of L-cysteine within the cell is all that is needed to increase glutathione synthesis, and N-Acetylcysteine does this efficiently at a lower financial cost than glutathione.

In effect, glutathione is an indirect and expensive way to provide dietary L-cysteine. Dietary protein itself, including L-cysteine rich sources such as Whey Protein, are effective but inefficient ways to increase L-cysteine intake in the diet and N-Acetylcysteine is both more efficient and cheaper than glutathione.
Although oral glutathione supplementation does not efficiently increase intracellular glutathione levels for the above reasons, it can be absorbed intact into the blood stream. Since increased glutathione levels in the blood have been shown to slow the breakdown of nitric oxide, glutathione supplementation may be useful to augment nitric oxide boosters such as L-Citrulline or L-Arginine.
 

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This is Grace from Zhengzhou Filter Biotechnology Co.,Ltd.We are the professional supplier of peptide products in China over 10 years. we have Professional Lab to confirm the Quality and Serive for all clients in long-term run cooperation.
Our Company as a Pharmaceutical Raw Material Manufacturer specialize in R&D the New Drugs and Producing the Generic Medicine:

Amino Acids
Pharmaceutical Polypeptide,
Comestic Polypeptide,
Veterinary Peptide and Pharmaceutical APIs.
Due to of the high quality and good service, They have been exported more than 30 countries. 
Sincerely hope to have a chance to cooperate with you. 

----------Additional Information  ------------
Brand: Filter
Package:Plastic Tube
Place of origin:China
Certificate: GMP
Minimum order quantity:10 kits
 
-----------Delivery Information  -------------
Packing : Plastic Tube/vials or as your request
Payment : T/T, ,Money Gram
Port : Shanghai, Shenzhen,Gunagzhou Hongkong
Shipment method : EMS,TNT, DHL, FeDex, UPS, etc
Leading  time : Within 24 hours after payment
Delivery time : safe & timely, around 3 days after payment

----------Our Competitive Advantages  -----------
1.Rich experience.
Our company is a professional production leading factory in China in pharmaceutical area of many years
2.Superior quality, purity and favourable.
Our company is a professional leading manufacturer in China in pharmaceutical area.Good quality is one of our secret success.
3.Safe and fast delivery.
We have GOLDEN FORWARDER and UK Warehouse  so we can delivery quickly and safely.
4.Package: Professional packing with professional materials.
5.Competitive Prices : Low price with high qulity.