Liu S-C, Yang S-F, Yeh K-T, Yeh C-M, Chiou H-L, Lee C-Y, et al
Doses can continue increasing in 0.5 mg steps every four weeks, up to the maximum level

Histamine can be stimulating or inhibiting in its actions, affecting multiple regions of the brain as well as the skin, cardiovascular, digestive, respiratory, reproductive, and immune systems.[3] Common causes for histamine intolerance include: Inflammatory bowel diseases (or anything that causes damage to the enterocytes the cells that line the gut) Coeliac disease Intestinal dysbiosis Small Intestinal Bacterial Overgrowth (SIBO) Parasitic infections, like Giardia Leaky gut or increase in intestinal permeability Alcohol or other DAO inhibitors Excess biogenic amines in diet Medications that increase histamine Food allergies Genetic polymorphisms, like MTHFR and others that lower DAO, MAO, ALDH Vitamin cofactor deficiencies enzymes, like DAO and MAO rely on vitamin co-factors and deficiencies of these can also cause abnormal enzyme activity The primary pathway by which endogenous histamine is metabolised in the body is via the enzyme histamine methyltransferase (HMT)

A skilled practitioner will explore factors such as nutrient status, gut health, underlying infections, immune function, stress and environmental factors to create a personalised plan to improve thyroid function
When it comes to L-effect carnitine's on athletic performance, the evidence is conflicting