Vitamin C is one of the most well-known and studied nutrients in the world. Found in fruits and vegetables, it is essential for the proper functioning of the body and one of the most in-demand supplements in Spain. But do you really know its benefits, what dosage you need, and when is the best time to take it? In this article, we'll tell you everything you need to know about vitamin C.

What is vitamin C and why is it so important?

Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that the human body cannot produce on its own. This means we must obtain it through food or supplementation. It acts as a powerful antioxidant and is a cofactor in the synthesis of collagen, the most abundant protein in the body.

Additionally, vitamin C improves the absorption of non-heme iron (iron from plants), participates in the synthesis of neurotransmitters like serotonin, and contributes to the regeneration of other antioxidants like vitamin E.

Main benefits of vitamin C

Immune system boost

One of the most popular uses of vitamin C is to support the immune system's defenses. It stimulates the production and activity of white blood cells (leukocytes), the cells responsible for fighting infections. Numerous studies have shown that it can reduce the duration and severity of common colds, although it does not completely prevent them.

Powerful antioxidant effect

We live in an environment with high oxidative stress: pollution, processed foods, chronic stress... Vitamin C neutralizes free radicals, unstable molecules that damage cells and accelerate aging. This antioxidant action also helps protect cellular DNA and maintain younger, brighter-looking skin.

Collagen synthesis and skin health

Without vitamin C, the body cannot synthesize collagen efficiently. Collagen is essential for skin firmness, the integrity of joints, tendons, and gums, and wound healing. Therefore, a vitamin C deficiency can manifest as bleeding gums, dry skin, or slow recovery from injuries.

Improves iron absorption

If you follow a vegan or vegetarian diet, vitamin C is your great ally. Consumed with plant-based iron-rich foods (legumes, spinach, tofu), it can increase its absorption by up to 67%. If you are taking iron supplements to combat anemia, combining them with vitamin C significantly improves their effectiveness.

What dose of vitamin C do you need?

Vitamin C needs vary by age, gender, and personal circumstances. The recommendations from the European Food Safety Authority (EFSA) are:

• Adults: 80-110 mg/day as a reference intake.
• Pregnant and lactating women: 100-155 mg/day.
• Smokers: it is recommended to add at least 35 mg extra, as smoking increases oxidative stress and vitamin C consumption.

Regarding supplementation, dietary supplements typically offer doses between 250 mg and 1,000 mg. Studies show that the body absorbs vitamin C better in divided doses throughout the day. Doses greater than 2,000 mg can cause gastrointestinal discomfort (diarrhea, nausea), although severe toxicity is extremely rare as it is a water-soluble vitamin that the body eliminates through urine.

When is the best time to take vitamin C?

Vitamin C can be taken at any time of day, as it has no sedative or stimulating effects. However, there are some practical recommendations:

• With meals: if you have a sensitive stomach, taking vitamin C with food can reduce potential gastric discomfort.
• In the morning: many people prefer to take it first thing in the morning to take advantage of its role in carnitine synthesis, a key molecule in cellular energy production.
• With iron: if you take iron supplements, always combine them with vitamin C to enhance their absorption.
• In divided doses: if you take 500 mg or more, divide them into two doses (morning and afternoon) to optimize absorption, as the intestine has a limited capacity for assimilation all at once.

Forms of vitamin C: which one to choose?

Not all vitamin C is the same. In the market, you will find different forms with different characteristics:

• Pure ascorbic acid: the most common and economical form. Very effective, although it can be more acidic for the stomach.
• Sodium or calcium ascorbate (buffered): buffered forms with a more neutral pH, ideal for people with gastric sensitivity.
• Liposomal vitamin C: encapsulated in lipids for greater bioavailability. Interesting for those who need higher doses.
• Vitamin C with bioflavonoids: bioflavonoids (such as rutin or quercetin) enhance antioxidant action and improve absorption.

Signs that you might be lacking vitamin C

A low level of vitamin C can go unnoticed for months. Some warning signs are:

• Persistent tiredness and fatigue.
• Bleeding or sensitive gums.
• Slow wound healing.
• Increased tendency to catch colds.
• Dry, rough skin or with small red spots (petechiae).
• Joint or muscle pain without apparent cause.

If you recognize several of these symptoms, consult your doctor and consider introducing vitamin C supplementation.

Vitamin C and vitamin D: a powerful combination for defenses

If your main goal is to strengthen your defenses, vitamin C works synergistically with vitamin D3. While vitamin C acts on the innate immune response (first line of defense), vitamin D regulates adaptive immunity. Combining both during autumn and winter is a common strategy recommended by many health professionals.

At AndaVida, you'll find a carefully curated selection of vitamin C supplements and nutrients for defenses from trusted brands like Solgar, Solaray, and Nutralie. Whether in capsules, tablets, or liposomal form, our catalog offers the most suitable option for your needs. Visit andavida.es and take the first step towards a stronger immune system and more balanced health.