From the Desk of Carolyn Dean MD ND
Everything Vitamin C Taught Us This Fall (And Why I Wrote a Whole Book About It)
Recently, we’ve flooded your inbox with seven posts about vitamin C benefits. Now it’s time to tell you more about the book that holds even more vital information.
Ten weeks ago, vitamin C was probably the thing you grabbed in the cold-and-flu aisle. Since then, we’ve followed it into your immune cells, energy production, stress response, joints, blood vessels, and even your DNA. Along the way, we’ve explored what happens when vitamin C runs low. We’ve also seen why a nutrient we’ve known about for nearly a century still has so much to teach us.
So, what does it all add up to?
For me, the most important lesson is that vitamin C is much more than something we think about when we feel a cold coming on. After all, it has essential jobs to do every day, in many different parts of the body.
Understanding those jobs helps us ask better questions about nutrition and appreciate the importance of a daily nutrient baseline. It also explains why I wanted to bring so much vitamin C research together in my new book, Vitamin C: Listening to the Experts.
Let’s revisit what we’ve learned, then look at the bigger story.
The Vitamin We Thought We Knew
Most people associate vitamin C with citrus fruits, immune support, and perhaps a glass of orange juice when someone starts sneezing. Because it’s familiar and inexpensive, we often treat it as a simple nutritional extra.
However, familiarity can make us overlook something important.
Vitamin C participates in a remarkable range of biological processes. For example, it supports structural collagen formation and the production of carnitine, which helps transport fuel for energy. In addition, it supports normal immune function and helps enzymes carry out important cellular processes.
That was the idea behind our fall series. Instead of looking at vitamin C through the narrow lens of colds, we explored immunity, energy, stress, recovery, healthy aging, women’s health, and deficiency.
Each topic revealed another part of the picture. When we put those pieces together, we begin to see why vitamin C deserves a place in our everyday conversation about nutrition. After all, its work continues long after cold season ends.
Vitamin C Benefits: Your Body’s Daily Workhorse
Immunity: More Than a Cold-Season Nutrient
In our August 6 post, we looked at vitamin C and the immune system. Vitamin C helps support the production and function of white blood cells, the specialized cells that help the body respond to potential threats.
In fact, some white blood cells concentrate vitamin C at levels far higher than those found in blood plasma. That reflects how important this nutrient is to their work.
We also explored the relationship between sugar and vitamin C transport. The oxidized form of vitamin C shares certain glucose transporters, while other transporters carry vitamin C in its reduced form. Therefore, the details are more complicated than a simple one-for-one competition. PubMed
Even so, the broader lesson is worth remembering: what we eat influences the nutritional environment in which our cells operate.
Read the original post: Vitamin C and Immunity, August 6.
Energy: Helping Turn Food Into Fuel
On September 10, we moved from immunity to energy. One of vitamin C’s important jobs is helping the body make carnitine. This compound helps transport fatty acids into mitochondria, where the body can use them for energy production.
I also discussed the partnership between vitamin C and magnesium. Because they support different but complementary processes, I often describe these nutrients as a team. As I put it in the series, vitamin C and magnesium “team up for ATP production.”
Magnesium-bound ATP, or Mg-ATP, powers countless cellular activities, from muscle contraction to cell maintenance.
Of course, energy production involves many nutrients and biological pathways. Within that larger system, vitamin C and magnesium each have important roles.
Read the original post: Vitamin C and Energy, September 10.
Stress: Your Adrenals Love Vitamin C
In our September 3 post, Adrenals Love Vitamin C, we explored another side of this nutrient. The adrenal glands help the body respond to stress. Meanwhile, vitamin C supports normal adrenal function and processes involved in producing certain hormones and neurotransmitters.
Stress also reminds us that nutrition doesn’t operate in isolation. Although the body continually uses nutrients for everyday functions, our needs and eating patterns can change with our circumstances.
That is why I encourage people to think beyond occasional supplementation. Instead, pay attention to the consistency of your nutritional habits.
I’ve also quoted Dr. Thomas Levy, who calls vitamin C “The Ultimate Antidote” when discussing its role in the body’s response to toxins. That phrase reflects my interest in the nutrient’s protective and metabolic functions. It also reflects my wish that medical settings could use it more widely.
Read the original post: Adrenals Love Vitamin C, September 3.
What We Learned: Vitamin C Builds and Protects
Recovery: Collagen Is a Big Part of the Story
On September 24, we looked at recovery and collagen. Collagen is a structural protein that makes up about 30% of total body protein. It’s found throughout the body, including in skin, connective tissue, joints, and blood vessels.
Because vitamin C is essential for normal collagen formation, adequate intake matters for wound healing and connective tissue maintenance.
When vitamin C intake is severely inadequate, the body cannot maintain normal collagen formation. As a result, recognizable signs of deficiency can develop over time, including easy bruising and problems with wound healing.
This is one of the clearest examples of vitamin C benefits beyond immunity. After all, it contributes to the physical structure that helps hold us together.
Read the original post: Vitamin C and Recovery, September 24.
Healthy Aging: Looking Inside the Cell
Our September 17 post explored a more specialized topic: vitamin C and the regulation of DNA methylation. Vitamin C helps the TET enzymes involved in this process do their work.
That is a small sentence describing a big area of biology.
Put simply, DNA methylation helps regulate how cells use genetic information. Because this is an active field of research, there is still much to learn. Even so, studying nutrients in these processes helps us appreciate how nutrition intersects with cellular function.
I also discussed magnesium’s place in the vitamin C story. In particular, I explored the relationship between these nutrients and the processes that recycle used vitamin C into its active form.
These interrelationships are part of the broader nutritional picture I wanted readers to consider.
Read the original post: Vitamin C and Healthy Aging, September 17.
Women’s Health: When Low Vitamin C Deserves a Closer Look
On October 8, we examined vitamin C in the context of women’s health. In particular, we discussed collagen formation, blood-vessel integrity, and iron absorption.
I have used the phrase “friable blood vessels” when considering how inadequate vitamin C may affect connective tissue. I’ve also discussed the possibility of low-grade scurvy.
However, heavy menstrual bleeding can have many possible causes beyond vitamin C deficiency. Therefore, anyone experiencing heavy, persistent, or unusual bleeding should seek evaluation from a qualified healthcare professional.
Vitamin C also helps the body absorb non-heme iron, the type found in plant foods and iron-fortified foods. As a result, the relationship between vitamin C, iron, and food choices is particularly relevant to women’s nutritional needs.
Read the original post: Vitamin C and Women’s Health, October 8.
What We Learned: Deficiency Can Hide in Plain Sight
Let’s go back to the discovery of vitamin C. Our October 1 post brought us to a subject I consider especially important. Scurvy!
Modern cases of scurvy continue to be reported. Because its signs can overlap with other conditions, some cases initially prompt investigations for serious problems such as arthritis or vasculitis.
This reminds us that nutritional deficiencies can sometimes be overlooked, particularly when symptoms are nonspecific.
We also discussed a U.S. analysis of national survey data collected in 2003–2006. Under the study’s definitions, approximately 42% of adults had insufficient plasma vitamin C levels.
That figure is worth revisiting. Although I suspect the numbers could be worse today, those older findings cannot tell us the current rate.
To help readers think about the range between depleted and well-supplied, I introduced a Scurvy Spectrum. However, its purpose is nutritional awareness and further learning. As I emphasize, it is an educational tool, not a diagnostic one.
If you recognize possible signs of deficiency, the next step is to discuss your concerns with a healthcare practitioner. They can help determine what evaluation, if any, is appropriate.
I say that while also acknowledging that vitamin C blood testing is not normally part of routine testing.
Read the original post: Vitamin C Deficiency and the Scurvy Spectrum, October 1.
Why I Wrote Vitamin C: Listening to the Experts
Seven posts can introduce a subject, but they can only take us so far.
As I gathered research for this series, I kept returning to a larger question. How much of the vitamin C story do we miss when we focus on a single recommended intake or familiar use?
That question is at the heart of my book, Vitamin C: Listening to the Experts.
I wanted to bring together the work of physicians and researchers whose contributions have shaped our understanding of this nutrient. Rather than treating a supplement label or any one person’s opinion as the final word, I wanted to explore the research.
Above all, I wanted readers to discover the history and the questions that continue to deserve attention.
From Discovery to Continuing Debate
The story begins with Albert Szent-Györgyi, whose work helped lead to the identification of vitamin C. His research included isolating the substance from paprika. Later, he received the 1937 Nobel Prize in Physiology or Medicine for discoveries related to biological oxidation.
From there, the story moves through later research and debate. For example, it explores Linus Pauling’s arguments for higher vitamin C intake.
It also revisits early investigations into collagen, blood vessels, artery-wall health, and the possible origins of heart disease.
Together, these contributions show why the history of vitamin C still gives us so much to discuss.
Looking Beyond a Single Daily Number
The book also revisits a familiar question. Why is the adult Recommended Dietary Allowance, or RDA, 90 milligrams per day for men and 75 milligrams for women?
I’ll leave you to read the rest of the story about vitamin C dosage in the book itself.
You see, unlike most other animals, we don’t make our own vitamin C. That is why I’m interested in exploring nutritional needs beyond simply preventing scurvy.
Think of our fall series as the highlights reel. Vitamin C: Listening to the Experts brings more of the history, research, and references together.
As a result, readers can explore these questions in greater depth and make better-informed decisions in conversation with their healthcare practitioners.
How Knowing More Can Change Your Everyday
You don’t need to become a vitamin C researcher to take something useful away from this series. Instead, recognize that nutrition is more than a collection of isolated nutrients. Small daily choices contribute to the bigger picture.
For example, you might pay closer attention to the vitamin C-rich foods on your plate. You might also look more carefully at the sugar in your diet or remember the complementary roles of vitamin C and magnesium.
Likewise, you may become more curious about the nutrients involved in energy production and collagen formation.
With that understanding, you might feel more prepared to ask your healthcare practitioner about your nutritional status. Do your diet, symptoms, or circumstances warrant a closer look?
These are not dramatic overnight changes. Rather, they are examples of what can happen when we understand the why behind everyday nutrition.
My approach has always been to encourage people to learn, ask questions, explore research, and discuss what they discover with their healthcare practitioners.
After all, good nutritional education doesn’t require us to accept every claim uncritically. It helps us distinguish established functions from emerging research, recognize what we don’t yet know, and make thoughtful decisions.
Keep Exploring Vitamin C Benefits
That is the real value of revisiting vitamin C from so many angles. This one nutrient has opened the door to conversations about immunity, energy, stress, connective tissue, cellular processes, women’s health, and deficiency.
And there is much more to explore.
If you’ve followed along this fall, thank you for being part of the journey. If you’re just joining us, you’re not late. The series has introduced the key ideas; now the book offers an opportunity to go further.
Get the full story in my book, Vitamin C: Listening to the Experts. It brings together the history, research, and expert perspectives that inspired this series.
In addition, if you’re exploring ways to support your daily nutritional routine, you can learn more about Whole C ReSet and Vitamin C ReSet Berry Powder. Consider them as part of your broader approach to nutrition.
Ultimately, understanding vitamin C benefits gives us another reason to stay curious about the nutrients our bodies rely on. Because the more we understand, the better equipped we are to ask informed questions and keep learning.
This content is for educational purposes only and discusses nutritional and lifestyle support for normal structure and function of the body. It is not intended to diagnose, treat, or cure disease. Consult a qualified healthcare professional for personal medical guidance.
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