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How to Improve Vitamin Absorption and Get the Most Out of Their Benefits

by La Boite à Grains 16 Nov 2025
Comment faciliter l’absorption des vitamines et mieux profiter de leurs bienfaits

Taking supplements is not always enough; the body must also be able to absorb them properly. The effectiveness of a vitamin depends directly on how it is absorbed by the body.

Many people take vitamins without experiencing the expected effects simply because absorption is insufficient.

This article explains how to naturally improve this assimilation through diet, good habits, and high-quality products available on La Boîte à Grains, the Canadian reference in natural health.

Why Some Vitamins Are Poorly Absorbed by the Body

Before talking about solutions, it’s important to understand why vitamin absorption can be a problem. Several factors come into play:

  • Digestive health: an imbalanced gut flora or a lack of digestive enzymes limits absorption capacity.
  • Age: over time, stomach acidity decreases, which slows digestion and therefore the absorption of certain nutrients.
  • Vitamin and mineral interactions: for example, calcium can reduce iron absorption.
  • Medications: some treatments, such as antacids, alter stomach pH and reduce the bioavailability of several vitamins.

Slow digestion or intestinal issues can also affect the effectiveness of a supplement plan. If this applies to you, natural probiotics like those available at La Boîte à Grains can help restore digestive balance.

Fat-Soluble Vitamins: The Essential Role of Healthy Fats and Oils

Some vitamins, known as fat-soluble vitamins, require the presence of healthy fats to be properly absorbed.

This is the case for vitamins A, D, E, and K. Without a source of lipids, the body cannot store or use them effectively.

1. Combine Your Fat-Soluble Vitamins with Healthy Fats

To optimize absorption, it is recommended to take these vitamins with a meal containing quality oils or foods rich in healthy fatty acids:

  • Olive oil: excellent for salads or cooked vegetables.
  • Flaxseed oil: rich in omega-3, supports cardiovascular and brain health.
  • Avocado, nuts, chia or sunflower seeds: great sources of healthy fats.

You can also include natural oil or high-quality omega-3 supplements available at La Boîte à Grains to improve vitamin bioavailability.

2. Choose More Readily Absorbed Vitamin Forms

Some forms of vitamins are more effective than others.

For example, vitamin D3 (cholecalciferol) is better absorbed than D2 (ergocalciferol).

For vitamin E, choose natural tocopherols rather than synthetic forms.

Discover a wide selection of natural vitamins at La Boîte à Grains, available in liquid, capsule, or powder form, depending on your needs.

How to Improve the Absorption of Water-Soluble Vitamins

Water-soluble vitamins, such as vitamin C and B vitamins, dissolve in water.

They are not stored in the body, which means a regular intake is necessary.

1. Take Them with Water... but Not at Any Time

For optimal absorption, take them during a light meal rather than on an empty stomach. This helps prevent gastric irritation and promotes absorption in the intestines.

2. Combine Vitamins Intelligently

  • Vitamin C + Iron: vitamin C greatly increases the absorption of plant-based iron.
  • Vitamin B6, B9, and B12: they work together to support energy production and cellular metabolism.
  • Avoid calcium + iron in the same meal: these two minerals compete for absorption in the intestines.

B vitamins are formulated to offer an ideal balance between energy, stress, and digestion.

The Role of the Digestive System in Vitamin Absorption

Absorption depends directly on the health of the digestive system.

An irritated intestine or imbalanced gut flora can prevent vitamins from being absorbed correctly.

1. Take Care of Your Gut Flora

Gut bacteria contribute to the synthesis of certain vitamins (notably vitamins K and B12).
An unbalanced flora, after antibiotics or a low-fibre diet, hinders absorption.

To restore microbiome balance, choose natural probiotics and prebiotics.

2. Stimulate Digestion Naturally

Efficient digestion allows better absorption.
Certain natural ingredients like ginger, turmeric, or peppermint enhance the production of digestive enzymes.

You can also support your digestion with natural formulas designed to ease discomfort and promote nutrient absorption.

Calcium and Its Interactions with Other Vitamins

Calcium is essential for bone health, but it sometimes interferes with the absorption of other nutrients.

1. Calcium and Iron: Be Careful with Interactions

Taken in excess, calcium can limit the absorption of iron and zinc.

To avoid this, it is recommended to take them at different times of the day:

  • Calcium in the morning
  • Iron or magnesium in the evening

2. Calcium and Vitamin D: A Winning Combination

On the other hand, calcium needs vitamin D to be properly absorbed.
This synergy is essential for bone and muscle health.

Discover natural calcium + vitamin D3 supplements that promote maximum absorption and support vitality.

Best Practices to Maximize Daily Absorption

1. Take Your Vitamins at the Right Time

  • Fat-soluble vitamins (A, D, E, K): take with a meal containing healthy fats.
  • Water-soluble vitamins (C and B): preferably in the morning or at midday to support energy.
  • Calcium: away from iron and magnesium to avoid absorption competition.

2. Vary Your Diet

Supplements do not replace a balanced diet.
Include natural vitamin sources every day:

  • Fresh fruits and vegetables for vitamin C and antioxidants.
  • Fatty fish, eggs, and fortified foods for vitamin D.
  • Legumes, nuts, and seeds for B vitamins and healthy fats.

3. Watch Your Hydration and Stress Levels

Proper hydration helps transport water-soluble vitamins.
Stress, on the other hand, depletes magnesium and B-vitamin reserves.

You can support your nervous balance with formulas such as Natural Factors Pure Magnesium Bisglycinate, gentle on the stomach and highly absorbable.

Supplement Forms That Promote Better Absorption

Some technologies significantly increase vitamin bioavailability:

Supplement Type

Advantage

Example

Liposomal forms

Vitamins are encapsulated in lipids → better cellular absorption

Liposomal vitamin C

Chelated forms

Minerals are bound to amino acids → faster absorption

Magnesium bisglycinate

Liquid forms

Ideal for children or people with slow digestion

Liquid vitamin complexes

Combined forms

Combine multiple synergistic nutrients (ex: calcium + D3 + K2)

Natural bone supplements

You can find these innovative, highly absorbable forms on La Boîte à Grains.

Conclusion

Improving vitamin absorption means maximizing the benefits of every nutrient you consume.

A balanced diet, healthy fats, good digestive health, and the choice of high-quality natural products make all the difference.

To help you find the right supplements, explore the complete range of natural vitamins and minerals available on La Boîte à Grains, selected for their purity, bioavailability, and compliance with Canadian standards.

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