I ordered magnesium for my grandfather (67 years old) based on doctors' advice for his heart and blood vessels. Unfortunately, he developed a chronic cough after two weeks of taking it, so we stopped. It may be due to the powder form; however, it was mixed with either milk or warm water. We're heading for an examination to identify the cause of the cough. I recommend consulting a therapist before use. I have previously ordered other bio-additives from this brand and found no issues with quality.
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