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Hi Vjkulkarni... Alpha Lipoic Acid is highly beneficial when used in proper dosages. But if you are also vegetarian or avoid all sugar completely then ALA will also have a significant hypoglycemic effect on the body -- because it also lowers sugar levels in the body. Excessive lowered sugar levels can also cause anxiety as well as headache, light-headedness, palpitations, sweating, shakiness, weakness, hunger, fatigue, nausea, and vomiting.
An imbalance of magnesium or potassium (excess calcium in diet) and lack of iodine in the diet can also be other causes of palpitations. Allergies is another one (gluten, lactose etc).