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Metformin has been shown to decrease the DAO enzyme.[ref] Vitamin B3 ( nicotinamide or niacinamide ) may increase histamine levels at doses of 100 mg or higher.[ref] Conditions Linked to High Histamine Levels When discussing histamine intolerance, the conversation often centers on foods and the symptoms affecting the gut or skin

Gut microbial health is also critical for the absorption of thyroid-relevant micronutrients, particularly iodine (needed for T4/T3 synthesis), selenium (required for deiodinase and glutathione peroxidase) and zinc (involved in TSH production and receptor binding)

Dectin-1 mediates the biological effects of beta-glucans

[PubMed 31692543]