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Most controlled studies are Russian, often older, and many are not easily accessible or replicated in large international randomized trials

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Persistent neurological symptoms, fatigue, or symptom recurrence before scheduled injections warrant medical review and possible dosage adjustment

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Histamine can increase intestinal permeability (leaky gut), leading to bloating, cramping, and digestive distress, such as by causing fluctuating diarrhea and constipation, gas, abdominal pain, and discomfort after eating high-histamine foods

When used dailyand taken alongside supportive nutrients like vitamin C and elemental seleniumglutathione becomes more effective