Foods high in sulphur-containing amino acids (like cysteine) are key: Eggs Lean meats and fish Whey protein Allium vegetables (garlic, onions) Cruciferous veg (broccoli, Brussels sprouts) Some foods contain glutathione itself - particularly avocado, spinach, asparagus, and okra - but cooking and storage rapidly degrade it
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The first step in the process involves the enzyme tyrosine hydroxylase which, like phenylalanine hydroxylase (of tyrosine synthesis), requires tetrahydrobiopterin (BH 4 , or also written H 4 B) as a cofactor
Its ability to influence gene expressionreportedly altering the activity of thousands of genesprovides a powerful model for investigating how cellular function can be modulated towards a regenerative state
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