Discover how vitamins and minerals interact in your body. Optimize nutrient absorption to get the most out of your diet.
Iron (Non-heme)
Vitamin C
Increases absorption by 4-6x.
Vitamin C converts non-heme iron to the more absorbable ferrous form.
Real Examples:
Turmeric (Curcumin)
Black Pepper (Piperine)
Increases bioavailability by 2000%.
Piperine in black pepper slows down the liver's metabolism of curcumin.
Real Examples:
Iron
Calcium / Dairy
Reduces absorption by up to 50%.
Calcium and iron compete for the same absorption pathways.
Real Examples:
Iron
Tea (Tannins)
Blocks absorption by 60-90%.
Tannins in tea bind to iron, forming unabsorbable complexes.
Real Examples:
Calcium
Vitamin D
Mandatory for calcium absorption.
Without Vitamin D, the body can only absorb 10-15% of dietary calcium.
Real Examples:
B Vitamins
Coffee
Hinders vitamin absorption.
Caffeine's diuretic effect accelerates the excretion of water-soluble B vitamins.
Real Examples:
Important Note!
Our bodies are complex systems. Interactions may vary from person to person. If you have a severe nutrient deficiency, consult a healthcare professional in addition to using this guide.
Nutrition is not just about what you eat, but what your body can absorb. Bioavailability refers to the degree to which a nutrient is absorbed from the digestive tract into the bloodstream and becomes available for use by cells. Many people consume the 'healthiest' foods but receive up to 50% less benefit due to poor nutrient combinations. This guide aims to increase the efficiency of your diet by helping you understand how nutrients support or inhibit each other.
Iron + Vitamin C: Absorption of plant-based (non-heme) iron is quite difficult. However, Vitamin C reduces iron to the more easily absorbed 'ferrous' form. Squeezing lemon over lentils is not just about taste; it is a fundamental biochemical strategy.
Vitamin D + Calcium: Calcium cannot be sufficiently absorbed from the intestines without the help of Vitamin D. Vitamin D triggers the synthesis of calcium transporter proteins in intestinal cells, protecting your bone health.
Turmeric (Curcumin) + Black Pepper (Piperine): The bioavailability of curcumin, the active ingredient in turmeric, is very low on its own. Piperine in black pepper slows down the liver's process of eliminating curcumin, increasing absorption by up to 2000%.
Nutrient interactions are not always positive. Some compounds bind to minerals in the digestive tract, making their absorption impossible. The most common example is calcium and iron. Since both use the same absorption channels in the intestines, the efficiency of an iron supplement taken with a high-calcium meal drops significantly.
Always consume fat-soluble vitamins (A, D, E, K) with a healthy fat source (olive oil, avocado, nuts). The efficiency you get from a carrot (Vitamin A precursor) in a fat-free salad is much lower than in one with a tablespoon of olive oil.
Scientific References