Possible side effects of grapefruit seed extract include nausea, vomiting, a swollen or painful tongue, and burning in the mouth, stomach or throat, according to Allina Health. Patients who experience allergy symptoms su... More »

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Grapefruit seed extract has various internal medicinal applications, such as treating skin disease, atherosclerosis, high cholesterol, obesity and more, claims WebMD. It can also be applied topically for skin irritations... More »

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According to the Global Healing Center, grapefruit seed extract has been used throughout South American, Asian and European history as a powerful antiviral and antibacterial remedy. High in antioxidants and bioflavonoids... More »

Some side effects of progesterone suppositories (or progesterone vaginal) include allergic reactions, as evidenced by hives; difficulty breathing and swelling in the face, throat or mouth; headache; numbness, especially ... More »

Serious side effects of niacin include nausea, vomiting, skin flushing combined with dizziness, light headedness and fainting, according to Everyday Health. Niacin may cause other serious side effects, such as uneven or ... More »

Common side effects of vitamin B-6 supplementation include nausea, drowsiness, headache, and tingling or mild numbness, according to eMedicineHealth. More serious side effects include tiredness, clumsiness in the hands, ... More »

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Common side effects of diphenhydramine citrate include drowsiness, dizziness, stomach upset, blurred vision, and dryness in the mouth, nose or throat. More serious side effects include mental changes, such as restlessnes... More »

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