These Supplements Should Never Be Combined, Say Health Experts

A quick glance at the vitamin section of your local pharmacy suggests the little pills are the ultimate health elixir, but experts suggest that taking too many could have the opposite effect. According to the National Institute of Health's MedlinePlus guide, an array of common supplements react with drugs and other vitamins in an unexpected way. 

If you're among the millions of Americans who incorporate fish oil, calcium, or St. John's wort supplements into your daily routine, there are a few facts you can't afford not to know. Health mined the lengthy guide to find out which supplements should never be taken together and why. If you turn to natural remedies for good health, don't make these common supplement mistakes. 

Blood Pressure–Lowering Drugs: Fish oil can boost the effects of this medication, causing blood pressure to lower too much. 

Birth Control: Birth control pills have been known to interfere with some of the desired benefits of fish oil, such as its ability to lower triglyceride, a type of fat found in your blood. 

Ginkgo: High doses of fish oil taken in tandem with a herb that lowers blood clotting might cause bleeding, Health reports. 

Antibiotics: Calcium supplements can reduce the effectiveness of antibiotics in the tetracycline and quinolone families.

Osteoporosis Drugs: It can also reduce the absorption of osteoporosis drugs known as bisphosphonates. 

Antidepressants: Combining St. John's wort with antidepressants could boost serotonin levels beyond the desired amount, which can lead to heart problems. 

Birth Control: St. John's wort could reduce the effectiveness of common birth control medication.