Unfortunately, tannins can also bind easily with some minerals such as iron, zinc and to a lesser extent calcium, and this can interfere with their absorption. It's best to leave a 30-minute gap between eating a meal and drinking tea to make sure you have the best chance to absorb these minerals.
Try to avoid taking your vitamins with coffee or tea
The tannins and caffeine can interfere with the absorption of many vitamins and minerals, especially iron. Caffeine also increases urination, which can decrease the concentration of water-soluble vitamins (B-complex and C).
Answer : In general, theres no need to be concerned about tea blocking the absorption of vitamins or other nutrients, according to Jeffrey B.
Caffeine significantly reduces the absorption rate of Iron in your intestines - believed to be up to 80%. Summary: Black tea and Green tea stop efficient absorption of Iron, Vitamin D and B-Complex vitamins.
To overcome the problem of vitamin B12 depletion, you should either leave several hours between taking B12 and tea or simply reduce or refrain from the consumption of drinks containing caffeine.
Antibiotics, Tetracycline: Vitamin B12 should not be taken at the same time as tetracycline because it interferes with the absorption and effectiveness of this medication. Vitamin B12 should be taken at different times of the day from tetracycline.
Taking vitamin B-12 with vitamin C might reduce the available amount of vitamin B-12 in your body. To avoid this interaction, take vitamin C two or more hours after taking a vitamin B-12 supplement.
We don't recommend you combine magnesium with caffeinated black tea, green tea, or coffee. Caffeine is a diuretic and speeds up the process by which your body excretes magnesium. So, keep your caffeine and your magnesium separate.
But caffeine causes the kidneys to release extra magnesium regardless of body status. If you drink caffeinated beverages such as coffee, tea and soda regularly, your risk for magnesium deficiency is increased.
Foods that are high in acidity, such as citrus fruits, can interfere with the absorption of catechins (antioxidants) found in tea. If you consume acidic foods at the same time as tea, it can reduce the amount of catechins that your body can absorb.
Steroids. Taking steroid mediations such as prednisone can reduce calcium absorption and impair your body's processing of vitamin D. Stimulant laxatives. Long-term use of high doses of stimulant laxatives can reduce vitamin D and calcium absorption.
Phenobarbital, phenytoin, and other anticonvulsant medications -- These medications may accelerate the body's use of vitamin D. Mineral oil -- Mineral oil also interferes with absorption. In addition, Vitamin D may enhance the effects of doxorubicin , a medicine used to treat a variety of cancers.
Water pills (Thiazide diuretics) interacts with VITAMIN D
Vitamin D helps the body absorb calcium. Some "water pills" increase the amount of calcium in the body. Taking large amounts of vitamin D along with some "water pills" might cause too much calcium in the body.
Caffeine in coffee, tea, and other beverages can interfere with the absorption of vitamins and minerals including Vitamin D, Calcium, some B vitamins, Iron, Potassium, Magnesium, Zinc, Copper, Manganese, and potentially vitamin A.
Phytates in the diet bind to magnesium and impair its absorption. However the quantities present in normal diet do not affect magnesium absorption. Other dietary factors that are thought to affect magnesium absorption are oxalate, phosphate, proteins, potassium and zinc.
Antibiotics: Taking magnesium supplements may reduce the absorption of quinolone antibiotics, tetracycline antibiotics, and nitrofurantoin (Macrodandin). Magnesium should be taken 1 hour before or 2 hours after taking these medications. Quinolone and tetracycline antibiotics include: Ciprofloxacin (Cipro)
Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with MAGNESIUM. Magnesium might slow blood clotting. Taking magnesium along with medications that also slow clotting might increase the chances of bruising and bleeding.
Don't use calcium, zinc, or magnesium supplements at the same time. Also, these three minerals are easier on your tummy when you take them with food, so if your doctor recommends them, have them at different meals or snacks.
Vitamin B12, for example, should definitely be taken in the morning. This is because it is important for energy metabolism, which may interrupt your sleep if taken at night.
Some people have a rare condition called pernicious anemia, which means their stomach does not make intrinsic factor. Because of this, their body cannot properly absorb vitamin B12, which causes a vitamin B12 deficiency.