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A groundbreaking case study found that a 61-year-old endurance cyclist improved his time trial performance by 7.2% after just four glutathione IV treatments - with no changes to training or diet

However, high doses may not provide extra benefits and should be avoided

Research suggests that people with lower glutathione levels may be more susceptible to illness, particularly respiratory infections, with some studies finding up to a 50% increased vulnerability during flu season in those with depleted levels

When you take oral glutathione, stomach acid and digestive enzymes break down most of it before it reaches the bloodstream