Vitamin C and Stress: Why Your Body Uses More Than You Think
- Dr Anupa Dharamsi
- Mar 11
- 11 min read
By Dr. Anupa Dharamsi, Chiropractor | Handcrafted Chiropractic, Māngere, Auckland Nervous system-focused chiropractic care | ACC & WINZ welcome
You're Doing Everything Right — So Why Does Your Body Still Feel Behind?
You eat well. You take your vitamins. You get to bed at a reasonable time. And yet there's this persistent feeling of being a step behind — slow to recover, quick to catch every cold that goes around, a body that feels like it's always playing catch-up.
If that resonates, here's something worth understanding.
One of the most common patterns I see in clinic — across patients with chronic tension, slow recovery, or recurring illness — is a body that's genuinely trying to keep up, but whose nutritional resources have been quietly running on a deficit. Not because they're not eating well enough. But because their body, under chronic stress, is using certain nutrients far faster than a normal diet can replenish them.
Vitamin C is at the top of that list.
Most people know vitamin C as the immune vitamin — the one you reach for at the first sign of a sniffle. But inside the body, vitamin C does something far more fundamental than fight colds. And once you understand the relationship between stress, your adrenal glands, and how quickly vitamin C gets used up, the picture of why you feel depleted starts to make a lot more sense.
What Vitamin C Actually Does (The Full Picture)
Vitamin C — ascorbic acid — is one of the most essential and wide-ranging nutrients in the human body. Most people know one or two of its roles. Here's the complete picture.
Vitamin C:
Supports immune function — both the immediate, frontline immune response and the adaptive immune system that learns and remembers
Regulates inflammation — acts as a powerful antioxidant, neutralising free radicals that drive chronic inflammatory signalling
Produces and repairs collagen — the primary structural protein in ligaments, tendons, discs, fascia, and skin
Supports blood vessel integrity — vitamin C is essential for the strength and flexibility of vascular walls
Assists with neurotransmitter synthesis — including norepinephrine, which plays a key role in focus and stress response
Protects cells from oxidative damage — particularly relevant during periods of high physical or emotional demand
That last three are the ones that rarely get mentioned — and they're the ones most relevant to understanding why stress changes everything.
"Fascia, the connective tissue that wraps every muscle and organ in your body, is approximately 70% collagen. Vitamin C is essential for collagen formation — which makes it directly relevant to how your body moves, recovers, and holds the structural work of chiropractic care."
The Stress-Adrenal-Vitamin C Connection
Here's the mechanism that changes how you understand this nutrient.
Your adrenal glands — two small glands that sit above your kidneys — are responsible for producing your stress hormones, including cortisol and adrenaline. These hormones coordinate your body's response to pressure, threat, and demand.
What most people don't know is that the adrenal glands contain some of the highest concentrations of vitamin C anywhere in the body — as much as 10 mmol/L. That concentration is there for a reason: vitamin C is directly involved in the synthesis and regulation of stress hormones.
When you experience stress — whether it's a difficult week at work, a physical injury, a long period of poor sleep, or years of accumulated pressure — your pituitary gland releases a hormone called ACTH. That hormone travels to the adrenal glands and signals them to produce cortisol. In the process, vitamin C is secreted and depleted from the adrenals.
Human research has confirmed this directly: the adrenal glands actively secrete vitamin C in response to ACTH — meaning every stress response your body runs comes at a direct nutritional cost.
When stress is occasional and manageable, the body replenishes. When stress is chronic — running day after day, week after week — the demand consistently outpaces the supply. Vitamin C levels in the body quietly drop. And then everything that depends on vitamin C starts to underperform.
The 2024 research is particularly compelling: a randomised controlled trial found that 1,000mg of daily vitamin C supplementation over two months measurably reduced elevated cortisol and DHEA-S levels in women under chronic stress — providing direct evidence that vitamin C plays an active role in moderating the stress hormone response, not just responding to it.
"During periods of stress, the body uses up to 7 times more vitamin C than normal. Most diets — even good ones — aren't built to compensate for that."
The Loop Nobody Talks About
Here's what makes this pattern persistent.
Chronic stress depletes vitamin C. And low vitamin C, in turn, makes the stress response worse — because the adrenal glands can't regulate cortisol as effectively without adequate ascorbic acid. The result is a quiet, self-reinforcing cycle:
Stress → Vitamin C depletion → Elevated cortisol → More tissue inflammation → Slower recovery → Increased physiological stress → More depletion
This loop runs quietly in the background for many people under sustained pressure. It's why they feel run down even when they're not technically sick. Why they catch things more easily. Why healing from injury or pain takes longer than it should. Why their body never quite feels like it's getting ahead.
Breaking the loop requires both sides: reducing the demand (nervous system regulation, stress load management) and replenishing the supply (consistent, adequate vitamin C intake).
Supplementing alone addresses one side. This is why I always return to the bigger picture in clinical conversations — vitamin C is a piece of the puzzle, not the whole solution.
Vitamin C, Fascia, and Structural Recovery
This is the connection I find most clinically relevant — and the one that almost never appears in standard vitamin C content.
Collagen is the most abundant structural protein in the human body. It forms the framework of tendons, ligaments, joint capsules, intervertebral discs, and fascia — the intricate web of connective tissue that wraps every muscle, nerve, and organ in your body. Fascia alone is approximately 70% collagen.
Vitamin C is not optional for collagen synthesis. It's essential. Without adequate vitamin C, the enzymes responsible for collagen cross-linking can't function properly. The result is collagen that's less organised, less strong, and less able to withstand the mechanical demands placed on it daily.
In a body under chronic stress — where vitamin C is consistently being drawn toward adrenal function and immune defence — collagen repair starts to fall behind. The connective tissue becomes more prone to micro-damage, slower to recover, and less elastic over time.
This shows up clinically as:
Joints that feel stiff and difficult to mobilise
Fascia that feels dense or adhesed rather than fluid and gliding
Tendons and ligaments that take a long time to recover from strain
A body that loses gains quickly — adjustments or massage that don't hold as long as they should
This last point is particularly relevant for chiropractic patients.
Why Vitamin C Matters After Your Adjustment
Chiropractic adjustments restore movement to restricted joints and improve the quality of signalling between your spine and nervous system. But the structural benefit of that work depends on the surrounding connective tissue being able to adapt and hold the change.
Ligaments stabilise joints. Fascia transmits force and communicates tension across the body. When these tissues are strong, elastic, and well-nourished, they support the corrections that chiropractic care makes. When they're depleted — slow to repair, poorly organised, nutritionally deficient — the body is slower to consolidate those changes.
Vitamin C is one of the key nutritional co-factors for this process. It supports the collagen synthesis that lets connective tissue remodel around improved joint mechanics. It supports the antioxidant environment that allows recovery to proceed without excessive inflammation.
This is why I sometimes talk to patients about nutrition as part of their care — not because nutrition replaces chiropractic, but because the two support each other. The adjustment initiates the change. The nutritional environment determines how well the body consolidates it.
You can read more about how the nervous system and structural health interact in How Your Nervous System Regulates Healing, and about the wider nutritional picture in Magnesium: The Mineral Your Nervous System Is Quietly Asking For.
Signs Your Body May Need More Vitamin C
Low vitamin C doesn't always announce itself dramatically. Instead, people notice a pattern of subtle, persistent signals:
Frequent colds or infections that linger longer than they should
Slow recovery from exercise, injury, or illness
Persistent fatigue that isn't fully explained by sleep quality alone
Joint stiffness or connective tissue discomfort that doesn't fully resolve
Easy bruising or gum irritation
Skin that's slow to heal or feels less resilient
A general sense of inflammation — achy, puffy, slow
Many of these are also signs of the broader stress-depletion pattern described above. They often appear together, which is the body's way of signalling that the resourcing picture needs attention — not just in one area but across the whole system.
Getting More Vitamin C Through Food
Food first is always the principle. The richest dietary sources of vitamin C in an NZ context include:
Kiwifruit — one of the highest concentrations per gram of any food; two a day provides well over the recommended daily intake
Red and yellow capsicum (bell peppers) — higher vitamin C content than oranges, and widely available year-round
Feijoas — a seasonal NZ favourite with a surprisingly strong vitamin C profile
Citrus fruit — oranges, lemons, mandarins; classic and still effective
Broccoli and Brussels sprouts — best eaten lightly cooked or raw to preserve vitamin C, which is heat-sensitive
Strawberries and kiwiberries — summer fruits that are among the most bioavailable sources
Fresh and minimally processed is the key principle. Vitamin C degrades with heat, prolonged storage, and exposure to air. A smoothie with fresh kiwifruit and spinach in the morning is a stronger vitamin C hit than most capsules.
When Supplementation Can Help
Even with a strong diet, there are periods when supplementation becomes genuinely useful. These include:
Sustained periods of stress (work, relationships, financial pressure, caregiving)
Recovery from injury, surgery, or illness
High physical training loads
Winter months when fresh produce variety decreases
Periods of frequent infection or slow immune recovery
On choosing a supplement:
Not all vitamin C supplements are equally absorbed. Standard ascorbic acid tablets are inexpensive and effective for general maintenance. Liposomal forms — where the vitamin C is enclosed within tiny fat particles — may offer improved cellular uptake, particularly at higher doses, and tend to be gentler on the digestive system for people who experience gut sensitivity to standard forms.
When choosing:
Look for clearly stated elemental vitamin C content (not just a "blend" weight)
Minimal additives and fillers
Practitioner-grade products from third-party-tested manufacturers where possible
For liposomal: check that the phosphatidylcholine content is substantive, not trace
A typical maintenance dose is 500–1,000mg daily. During periods of high stress or acute illness, some practitioners recommend 1,000–2,000mg in divided doses. For ongoing guidance on supplementation as part of a broader health picture, it's worth a conversation with your health provider.
A Note on the Cortisol Cocktail Trend
You may have seen the "cortisol cocktail" trend on social media — a drink combining orange juice or vitamin C, coconut water (potassium), and sea salt (sodium), claimed to address stress-related adrenal depletion.
The instinct behind it is understandable and partially grounded — stress does deplete key nutrients including vitamin C, and there is good evidence that vitamin C plays an active role in moderating cortisol levels. But it's worth understanding clearly: the adrenal glands don't "burn out" from lifestyle stress in healthy people. The issue is demand exceeding supply, not glandular failure.
The cortisol cocktail, at best, offers a reasonable vitamin C and electrolyte hit. At worst, it creates false reassurance that a drink is addressing what is actually a systemic regulatory pattern. The deeper question is always: what is generating the stress load, and what is the body's capacity to recover from it?
Nutrition supports that recovery. So does nervous system care. Neither replaces the other.
Frequently Asked Questions
How much does stress actually increase vitamin C demand? Research suggests the body can use up to seven times more vitamin C during sustained periods of stress compared to a baseline state. This is because the adrenal glands actively secrete vitamin C as part of the cortisol production process — meaning every activation of your stress response has a direct nutritional cost. A diet that easily meets your baseline needs may fall significantly short during a demanding period of life.
Is vitamin C deficiency common in NZ? Clinically significant scurvy is rare in New Zealand. But subclinical depletion — levels that are technically above the scurvy threshold but too low for optimal collagen synthesis, immune function, and antioxidant activity — is more common than most people realise, particularly among people under chronic stress, smokers, and those with limited fresh produce intake. Blood tests for vitamin C exist but are not routinely ordered; symptom-based assessment is often more clinically useful.
Can vitamin C help with chronic inflammation? Yes, through several mechanisms. As a potent antioxidant, vitamin C neutralises the free radicals that drive inflammatory signalling. It also modulates the production of certain inflammatory cytokines and supports the resolution phase of inflammation. For people in a chronic low-grade inflammatory state — which is common alongside long-term stress — consistent vitamin C intake is a useful part of the anti-inflammatory nutritional picture.
Does vitamin C help with joint pain and stiffness? Directly, through its role in collagen synthesis — which supports the structural integrity of joints, ligaments, and fascia. Indirectly, through its anti-inflammatory and antioxidant activity. Clinical research including two 2025 meta-analyses found that vitamin C significantly reduced post-operative pain and opioid requirements in surgical patients — providing evidence for its role in musculoskeletal pain management. For chronic joint stiffness, particularly in people with high stress loads, addressing vitamin C status is a sensible part of the picture.
Should I take vitamin C with other supplements? Vitamin C works well alongside several other key nutrients. Vitamin D absorption and activation is supported by adequate magnesium — and vitamin C and magnesium work synergistically in the stress-regulatory picture. Vitamin C also regenerates vitamin E after it's been oxidised — keeping both antioxidants active. Taking vitamin C with iron-rich plant foods significantly improves iron absorption. For a broader overview of nutritional support and the nervous system, see our post on Why Your Immune System May Not Be Working at Full Capacity.
The Bigger Picture
Vitamin C is remarkable — and it's also just one piece.
The body's ability to recover, regulate inflammation, repair connective tissue, and maintain immune resilience depends on a nutritional foundation working in concert with an adequately regulated nervous system. When chronic stress is drawing on that foundation faster than it can be replenished — and when the nervous system is stuck in a state that keeps generating that demand — no single supplement fully closes the gap.
What changes the pattern is addressing both sides: restoring the nutritional environment and reducing the load the nervous system is carrying.
That's the conversation we have at Handcrafted Chiropractic — not just about where the pain is, but about what the body is carrying, and what it needs to genuinely recover.
Ready to Look at the Whole Picture?
If your body has been slow to recover, quick to get sick, or carrying a level of tension and depletion that lifestyle changes alone haven't shifted — it might be time to look at what's happening at the level of the nervous system.
At Handcrafted Chiropractic in Māngere, we work with people across South Auckland — Māngere, Māngere Bridge, Ōtāhuhu, Māngere East — who are ready to move beyond managing symptoms and toward genuine resilience.
ACC and WINZ welcome.
Not sure where your nervous system is currently sitting? Take our free 2-minute Nervous System Quiz — it's a useful starting point.
Dr. Anupa Dharamsi is the founder and lead chiropractor at Handcrafted Chiropractic, a nervous-system-focused, trauma-informed practice in Māngere, Auckland. She works with patients experiencing chronic stress, pain, fatigue, and slow recovery — looking at the whole picture of what the body is carrying and what it needs to heal. ACC & WINZ welcome.
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