I often hear some patients ask: Is there any side effect of Sulforaphane and if so, can it be used or not? Answer: Any drug has side effects, and sulforaphane is no exception. It may cause muscle tremors, but they may disappear after a while. Arrhythmias (including atrial fibrillation, supraventricular tachycardia and extrasystoles) may occur in some patients, but usually in sensitive patients. It may also cause hoarseness and oropharyngeal candidiasis (thrush), the occurrence of which can be reduced if the mouth is rinsed immediately after each dose. If one does not receive treatment because of the so-called side effects of the drug, one is refusing all treatment and sitting on the sidelines, because drugs without side effects hardly exist in the world. Of course, it is normal for patients to consider the side effects of drugs when receiving medication, but it is important to treat them scientifically, depending on whether the medication is reasonable and necessary, and weighing the benefits against the disadvantages. If asthma or COPD is to be controlled, then it needs to be used. If there are troublesome side effects after using it (which is of course very rare), then it has to be suspended. If rice is considered as a medicine, it also has side effects because it can cause obesity, diabetes, etc. If you look at salt as a drug, the side effects are even more frightening, as it can cause electrolyte disorders, abnormal brain function, high blood pressure, and even heart disease. Would you stop eating without salt because of these possibilities?