
Although cranberry juice is safe to consume in moderation, drinking too much can cause side effects such as upset stomach, diarrhea, and blood sugar spikes.
In the past, it was believed that cranberry juice can slow the growth of bacteria and therefore is useful in treating urinary tract infections. However, recent studies have shown that although cranberry juice may help prevent bacteria from sticking to the urinary tract wall, it doesn’t do enough to make a significant difference.
Cranberry juice is high in salicylic acid, which may alleviate swelling and blood clots in the body. Therefore, it may do more for boosting heart health than urinary tract health.

Who should exercise caution when drinking cranberry juice?
Cranberry juice should be used with caution if you have the following conditions:
- Diabetes: Sweetened cranberry juice can cause blood sugar spikes due to the presence of added sugar.
- Kidney stones: Cranberry juice is high in oxalates, which can lead to kidney stones.
- Pregnancy and breastfeeding: Since there isn’t much information regarding the safety of drinking cranberry juice while pregnant, most experts recommend avoiding cranberry juice if you are pregnant or breastfeeding.
- Aspirin allergy: Aspirin is similar to salicylic acid. Since cranberry juice contains a significant amount of salicylic acid, it is best to avoid drinking it if you are allergic to aspirin.
- Blood thinner medications: Some studies report that cranberries can react negatively with blood thinners such as warfarin.
Cranberry juice may interact with the following medications:
If you are taking these medications, consult your doctor about how much cranberry juice is safe to consume.

QUESTION
According to the USDA, there is no difference between a “portion” and a “serving.” See AnswerWhat are the health benefits of cranberry juice?
Although there are side effects to drinking excessive amounts, cranberry juice is loaded with vitamin C and is good for you in moderation:
- Acts as a powerful antioxidant: Antioxidants prevent free radicals from damaging your cells and can protect against chronic diseases such as heart disease and cancer.
- Boosts immune system: Vitamin C in cranberry juice helps fight bacterial and viral infections. According to one study, cranberries can eliminate norovirus—a common cause of foodborne illness.
- Improves heart health: Studies report that cranberry juice can reduce blood pressure and body mass index, which can contribute to heart health.
Nutrient | Amount |
---|---|
Water | 87.1 grams |
Energy | 46 kcal |
Protein | 0.39 grams |
Total fat | 0.13 grams |
Carbohydrates | 12.2 grams |
Fiber | 0.1 grams |
Sugar | 12.1 grams |
Calcium | 8 mg |
Iron | 0.25 mg |
Magnesium | 6 mg |
Phosphorus | 13 mg |
Potassium | 77 mg |
Sodium | 2 mg |
Zinc | 0.1 mg |
Copper | 0.055 mg |
Selenium | 0.1 µg |
Vitamin C | 9.3 mg |
Thiamin | 0.009 mg |
Riboflavin | 0.018 mg |
Niacin | 0.091 mg |
Vitamin B6 | 0.052 mg |
Vitamin A | 45 IU |
Vitamin E | 1.2 mg |
Vitamin K | 5.1 µg |
Health News
- Dementia Risk Rises for Elite European Soccer Players
- Gonorrhea: What It Is, Symptoms, Treatment & More
- 'Artificial Pancreas' Technology Boosts Blood Sugar Control for Young Kids With Type 1 Diabetes
- FDA Advisors Back Full Approval of Paxlovid
- Could COVID Trigger 'Face Blindness'?
More Health News »
Health Solutions From Our Sponsors
https://www.webmd.com/vitamins/ai/ingredientmono-958/cranberry
https://www.webmd.com/diet/health-benefits-cranberry-juice
https://fdc.nal.usda.gov/fdc-app.html#/food-details/168117/nutrients
https://www.nccih.nih.gov/health/cranberry
Top What Happens If You Drink a Lot of Cranberry Juice Related Articles
Heart Healthy Diet: 25 Foods You Should Eat
What foods are heart healthy? Learn what foods help protect your cardiovascular system from heart attack, coronary heart disease, stroke, and cardiovascular disease. Plus, find easy meal recipes and menu ideas for more everyday heart benefit.cranberry (vaccinium macrocarpon) - oral
Body Blood Sugar Levels
High blood sugar can be a sign of diabetes or prediabetes. The drugs that treat it sometimes cause low blood sugar too. WebMD helps guide you through the effects of both.High-Sugar Fruits
Sugar content in fruit varies. High-sugar fruits include mangoes, pears, grapes, cherries, bananas, figs, and watermelon. Low-sugar fruits include avocados, guava, raspberries, cantaloupe, papayas, and strawberries.Does Natural Sugar Count Toward Daily Intake?
As per World Health Organization (WHO) guidelines, natural sugar does not count toward the daily intake because fruits and vegetables are high in fiber and there are no reported negative health effects associated with natural sugar in produce.All About Antioxidants
They're sometimes seen as a kind of magic bullet for our health problems. Find out more about what antioxidants can do for your health.Sugar Quiz
Sugar lurks in surprising places. Take the Sugar Quiz to learn of the many ways sugar sneaks into your diet and see what you know about sugar and artificial sweeteners!What Are the Benefits of Drinking Cranberry Juice?
Cranberries, also called American cranberries or bearberries, are the fruits of the evergreen cranberry shrub. The cranberry plant (scientific name: Vaccinium macrocarpon) is a small creeping or trailing plant that belongs to the Ericaceae family.What Foods Have the Highest Antioxidants?
What are antioxidants? Learn the potential benefits and which foods have the highest antioxidants.What Foods Will Lower Blood Sugar Quickly?
Diabetes or diabetes mellitus is a long-term health condition that is characterized by high blood glucose levels. The disease affects the ability of the body to convert food into energy inside the body. The food you eat is converted to simpler forms, most commonly glucose, inside the body.What Happens to Your Body When You Eat Too Much Sugar?
When you eat too much sugar you increase your risk for obesity, type 2 diabetes, heart issues, some cancers, and damage to the liver.