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Standard oral glutathione tablets often have poor bioavailability because the digestive enzymes in your stomach are very good at breaking down proteins

The 28-day rule is a hard cutoff bottles that look pristine at day 30 still get discarded under standard practice

Glutathione is naturally found in protein (like beef and poultry), greens (like kale and spinach), and in sulfur-rich cruciferous veggies (such as broccoli, cauliflower, and Brussels sprouts), says Tasneem Bhatia, M.D

But are they legitimate

The body needs time to adapt to any new compound, and starting low reveals individual sensitivity before committing to higher doses

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