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 can affect your body's ability to absorb those nutrients.

Coffee can prevent the body from absorbing certain vitamins and minerals - Photo: FREEPIK

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

Iron

Iron is important for growth, hormone production, and cell function, and many people are deficient in it. However, drinking coffee with iron supplements or fortified cereals can cause your body to absorb less iron.

In the long term, consuming too much caffeine can negatively impact bone and mineral health. One study found that drinking coffee with iron reduced absorption by 54%. Eating it with breakfast reduced absorption even further.

This interaction is not due to caffeine, but to chlorogenic acid, a polyphenol found in coffee and tea. This compound is a potent inhibitor of the absorption of non-heme iron (the kind found in plant foods and supplements). Researchers believe that the polyphenol may affect the way the gut absorbs iron.

Separate iron 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 difficult nutrient to get through diet alone, as it is not naturally found in many foods. However, our bodies can synthesize vitamin D from sunlight.

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

To maximize the effectiveness of your supplement, take it at least an hour before or after coffee. And since 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, aids in energy production, nerve function and red blood cell formation.

Because B vitamins are water-soluble, the mild diuretic effect of caffeine can increase the amount of vitamins excreted by the body, especially when caffeine is consumed in large amounts. Several studies have shown that coffee drinkers tend to have lower blood levels of B vitamins, possibly due to urinary losses.

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

Magnesium

Magnesium is an important mineral that helps synthesize proteins, regulate blood sugar, control blood pressure, and improve sleep quality. Although found in foods like beans, nuts, and yogurt, many people do not get enough from their diet. Caffeine can increase the loss of calcium and magnesium through urine.

If you are in the habit of taking magnesium before bed to help you sleep better, it is best to avoid caffeine close to bedtime. Not only can caffeine make it harder to fall asleep, it can also reduce the effectiveness of magnesium in helping you sleep deeper.

Calcium

Like magnesium, calcium may also be affected by the diuretic effects of coffee. Calcium absorption may be reduced by caffeine, but the clinical impact is unclear. One study found that people who consumed caffeine excreted 77% more calcium through their kidneys than those who took a placebo.

Adding milk to your coffee can help replace lost calcium, and calcium supplements should be taken at least an hour after coffee, or two hours before, to aid in better absorption.

Nha Linh

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