5 types of supplements that should not be taken with coffee.

If you have a habit of drinking coffee and taking vitamins or minerals in the morning, be aware that coffee may affect your body's ability to absorb those nutrients.

Coffee can interfere with the body's absorption of certain vitamins and minerals - Photo: FREEPIK

According to Eating Well , caffeine, polyphenols, and the mild diuretic effect of coffee can interfere with the body's absorption of certain vitamins and minerals.

Iron

Iron is crucial for growth, hormone production, and cell function. It's also a nutrient that many people are deficient in. However, drinking coffee along with iron supplements or iron-fortified cereals may lead to less iron absorption by the body.

In the long term, consuming large amounts of caffeine can negatively impact bone health and mineral levels. One study showed that drinking coffee with iron reduced absorption by up to 54%. Eating it with breakfast further reduced absorption.

This interaction doesn't come from caffeine but from chlorogenic acid, a polyphenol found in coffee and tea. This compound is a potent inhibitor of non-heme iron absorption (the kind found in plant-based foods and supplements). Researchers believe that polyphenols may affect how the gut absorbs iron.

Separate iron supplements and coffee by at least an hour, and combine iron with foods rich in vitamin C, such as lemons or oranges, to increase absorption.

Vitamin D

Vitamin D is a nutrient that is difficult to obtain through diet alone, as it is not naturally present in many foods. However, our bodies can synthesize vitamin D through sunlight.

Research has shown that caffeine can lower vitamin D levels in the body. A 2021 study indicated that high caffeine intake was associated with lower vitamin D levels.

To optimize the effectiveness of supplements, take them at least an hour away from coffee. And because vitamin D is a fat-soluble vitamin, you should take it with a meal containing healthy fats to increase absorption.

B vitamins

This group of water-soluble vitamins, including B1, B2, B7, B9, and B12, supports energy production, nerve function, and red blood cell formation.

Because B vitamins are water-soluble, the mild diuretic effect of caffeine may increase the amount of vitamins the body excretes, especially when consuming large amounts of caffeine. Many studies have shown that people who regularly drink coffee have lower blood levels of B vitamins, possibly due to loss through urine.

Avoid taking supplements with coffee or tea. If possible, wait an hour. Water-soluble vitamins (C, B vitamins) can be taken with or without food, but are generally easier to take after a meal.

Magnesium

Magnesium is an important mineral that helps synthesize protein, regulate blood sugar, control blood pressure, and improve sleep quality. Although it is found in foods such as beans, nuts, and yogurt, many people still don't get enough from their diet. Caffeine can increase the loss of calcium and magnesium through urine.

If you have a habit of taking magnesium before bed to help you sleep better, it's best to avoid caffeine close to bedtime. Caffeine not only makes it harder to fall asleep, but it can also reduce the effectiveness of magnesium in promoting deeper sleep.

Calcium

Similar to magnesium, calcium can also be affected by the diuretic effect of coffee. Calcium absorption may be reduced by caffeine, but the clinical implications are unclear. One study showed that people who consumed caffeine excreted 77% more calcium through their kidneys compared to a placebo group.

Adding milk to your coffee can help replenish lost calcium, and you should drink calcium supplements at least an hour after your coffee, or two hours before, to aid better absorption.

Nha Linh

Source: https://tuoitre.vn/5-loai-thuc-pham-bo-sung-khong-nen-dung-chung-voi-ca-phe-20250805200644779.htm