"Never Take These Supplements With Coffee"... Nutrients That Can Be Harmful When Combined

The vitamins and supplements you take daily for your health may not work as intended if consumed with a cup of coffee. Some nutrients have reduced absorption rates or weakened effects when taken together with caffeine, making it important to carefully time your intake.

Supplement Image. Clipart Korea

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On March 31 (local time), U.S. health media outlet Verywell Health, citing the opinion of pharmacist Christy Reed, introduced five supplements that are not recommended to be taken with coffee.

First is iron. Iron is an essential nutrient for transporting oxygen in the blood and maintaining cellular function. Supplementation is especially recommended for those with iron deficiency.

The problem is the combination with coffee. The tannins and polyphenols in coffee can bind with iron and disrupt its absorption in the intestines. Experts recommend that if you take iron supplements, you should leave at least a two-hour gap before or after consuming coffee. This is because the timing of intake can significantly affect how much iron is absorbed.

Coffee image. Getty Images

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Water-soluble vitamins such as the B vitamins and vitamin C may also be lost if taken with coffee. Caffeine has a diuretic effect that increases urination, which can cause water-soluble vitamins that are not stored in the body to be excreted. This effect is even greater if you drink coffee frequently or in large amounts.

Vitamin D and calcium can also be affected during absorption if consumed with coffee. Caffeine may inhibit the function of receptors needed for vitamin D activity, which in turn can influence calcium absorption. In addition, caffeine has been reported to increase calcium excretion in the urine and reduce intestinal absorption.

While typical coffee consumption may not have a significant impact on bone density, extra caution is needed for those who are deficient in calcium or at risk for osteoporosis.

Essential minerals such as magnesium and zinc may also have decreased bioavailability if taken with coffee. Polyphenols and tannins in coffee can bind with these minerals and block their absorption, and the diuretic effect can further increase their excretion from the body.

Coffee image. Pixabay

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Melatonin supplements, which aid sleep, are among the least compatible combinations with coffee. Melatonin is a hormone secreted in darkness to regulate circadian rhythms, but caffeine suppresses its production and keeps you alert. The closer it gets to bedtime, the more pronounced this effect becomes. Experts advise avoiding caffeine for at least six hours before sleep, and for some individuals, limiting caffeine up to ten hours before bedtime may be necessary.

Experts recommend separating the timing of supplement and coffee intake as the most practical way to avoid interactions. Rather than taking supplements and coffee together, leaving at least a few hours between them can help increase absorption rates and maintain their effectiveness.

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