Optimal Vitamin C Dosage: How Much Should I Take?

Did you know that Vitamin C, also known as ascorbic acid, plays a crucial role in supporting the immune system, promoting collagen production for anti-aging benefits, and acting as a powerful antioxidant? To ensure you’re reaping all the benefits of this essential nutrient, it’s crucial to determine the optimal dosage of Vitamin C for your daily intake. While the US RDA (recommended daily allowance) is 90 milligrams (mg) for men and 75 mg for women daily (e.g., to prevent scurvy), the optimal dosage is much larger.

While there is no consensus, we recommend 1000mg for men and 800mg for women. There is no toxicity for higher dosages of Vitamin C. However, the UL is cited as 2000mg although many people take 10,000 to 18,000mg per day for years without any negative repercussions. Whether you’re considering increasing your Vitamin C consumption through dietary sources or supplementation, understanding the ideal dosage can significantly impact your overall health.

So, how much vitamin C should you take daily? Let’s explore the recommended dosage and factors influencing individual needs to help you make informed decisions about your Vitamin C intake.

Key Takeaways:

  •  Optimal Vitamin C dosage is essential for maintaining good health.
  •  Vitamin C supports the immune system, and collagen production is a powerful antioxidant.
  •  Determining the proper Vitamin C dosage depends on individual factors such as age, sex, and overall health.
  •  Consulting a healthcare professional can help determine the appropriate daily Vitamin C intake for your needs.
  •  Meeting the recommended Vitamin C dosage can contribute to overall well-being.

How Much Vitamin C Should I Take a Day?

The recommended daily Vitamin C intake depends on several factors, including age, sex, and overall health. According to the National Institutes of Health (NIH), the recommended daily allowance (RDA) of Vitamin C for healthy adults is 75-90 milligrams for women and 90-120 milligrams for men1.

recommended vitamin C dosage

Determining Your Optimal Vitamin C Intake

When meeting your daily Vitamin C needs, several factors come into play, influencing the optimal intake for each individual. Let’s explore these factors and learn more about the recommended dosage of Vitamin C based on age, gender, and specific situations.

Factors Influencing Vitamin C Needs

Various factors can impact your body’s requirements for Vitamin C. These factors include:

  • Absorption: Your body’s ability to absorb and utilize Vitamin C from dietary sources or supplements can affect how much you need.
  •  Lifestyle Choices: Certain lifestyle choices, such as smoking or experiencing high-stress levels, can increase your body’s Vitamin C needs.
  •  Health Conditions: Certain conditions or situations, such as pregnancy or post-surgery recovery, may require higher levels of Vitamin C to support healing and overall well-being.
vitamin C absorption

Recommended Daily Allowance of Vitamin C by Age and Gender

The recommended daily allowance (RDA) of Vitamin C varies based on age and gender. We think these recommendations are woefully low. The following table outlines the RDA values for different age groups:

Age GroupMale RDA (mg/day)Female RDA (mg/day)
Infants (0-6 months)4040
Infants (7-12 months)5050
Children (1-3 years)1515
Children (4-8 years)2525
Children (9-13 years)4545
Adolescents (14-18 years)7565
Adults (19+ years)9075
Pregnant women8585
Lactating women120120
how much vitamin c should i take a day

Vitamin C Supplement Dosage Recommendation

Remember, Vitamin C supplements complement a healthy diet and lifestyle, not replace it. It’s always advisable to strive for a balanced Vitamin C intake through a combination of dietary sources and supplements, if necessary, to ensure maximum benefits for immune support and overall well-being.

We suggest 1000mg for men and 800mg for healthy women. Vitamin C has shown to be great in fighting viral infections. So if you are sick with a virus we suggest gradually increasing that dosage to 10,000mg in divided dosages. Vitamin C only stays in the blood stream about 2 hours so supplementing every two hours provides a near-continuous supply of Vitamin C to tissue. If you get loose stool, you should back off the dosage slightly. I take both regular Vitamin C and liposomal Vitamin C (which does not cause any stool issues) when I am ill.


Based on the comprehensive overview of Vitamin C’s role in health, determining an optimal daily intake cannot be overstated. Vitamin C is crucial for supporting the immune system, promoting collagen production, and serving as a potent antioxidant. While the recommended daily allowance (RDA) set by the National Institutes of Health (NIH) offers a baseline for preventing deficiencies, individual needs may vary significantly based on age, sex, lifestyle choices, and specific health conditions.

The RDA suggests 75-90 milligrams per day for most adults, with higher allowances recommended for specific groups like pregnant and lactating women. However, the suggestion of a higher intake—up to 1000mg for men and 800mg for women—underscores the belief that optimal health benefits from Vitamin C are significant. It’s crucial to note that higher dosages of Vitamin C (even up to 10,000-18,000mg per day) have been consumed by some individuals without reported adverse effects and may be of high value to those suffering from a viral infection.

The key takeaway is that the optimal Vitamin C dosage is not one-size-fits-all but should be tailored to an individual’s health profile and needs. Consulting with a healthcare professional is the best approach to determining the most appropriate Vitamin C intake for your unique situation. Whether through dietary sources or supplementation, achieving adequate Vitamin C information is essential for maintaining overall well-being and harnessing the full spectrum of benefits offered by this crucial nutrient.


What factors influence Vitamin C needs?

Several factors can influence the optimal intake of Vitamin C. These factors include Vitamin C absorption, certain health conditions, lifestyle choices like smoking or stress, and specific life stages such as pregnancy or post-surgery recovery. It is essential to consider these factors to ensure you meet your body’s Vitamin C requirements.

What is the recommended daily allowance of Vitamin C by age and gender?

The recommended daily allowance (RDA) of Vitamin C varies based on age and gender. The adult RDA ranges between 75-90 milligrams for women and 90-120 milligrams for men. On the other hand, children have different guidelines, with an RDA of 15-75 milligrams, depending on age. The RDA for older people is similar to that of adults. We think this is inadequate so we recommend you speak with a doctor.

What is the recommended Vitamin C supplement dosage?

Following the recommended dosage guidelines is essential if you are considering supplementing your Vitamin C intake. A daily dosage of 1000mg for men and 800mg for women is what we recommend for adults. However, it is advised to consult with a healthcare professional to determine the appropriate supplementation dosage based on your specific needs.


  1. Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids ↩︎