Which Nutrients Does Your Body Burn Through First Under Chronic Stress?

When stress is sustained over weeks rather than hours, three nutrients are depleted before most others: Vitamin B6, Vitamin B12, and Vitamin D. These are not minor players. B6 and B12 are required cofactors for the synthesis of serotonin, dopamine, and GABA, the neurotransmitters that regulate mood, calm, and cognitive function. Vitamin D plays a role in the body's stress response and has a documented inverse relationship with perceived stress in non-pregnant adult populations. Replenishing all three during a sustained stress sprint supports your nervous system's ability to keep functioning at the level you need it to.

Why the body depletes nutrients faster under stress

Two things happen simultaneously when stress is sustained. First, metabolic demand increases: the nervous system is running at higher intensity, requiring more cellular energy and more of the cofactors that support neurotransmitter production. Second, absorption efficiency decreases: cortisol diverts blood flow and energy away from the digestive tract, which is not a priority during a perceived threat. The result is a widening gap between what the body needs and what it can absorb from food, even when diet quality is good.

This gap does not produce clinical deficiency overnight. It produces a functional insufficiency, status that is technically within normal range but not sufficient for the demand the body is currently under. Women in this zone often describe the experience as feeling depleted without being able to point to a clear cause.

Vitamin B6: the GABA and serotonin cofactor

Vitamin B6, in its active form as pyridoxal-5-phosphate (P5P), is required for the synthesis of GABA from glutamate and serotonin from tryptophan. Both neurotransmitters are foundational to the experience of calm and mood stability under pressure. Research published in Gut Microbes via the National Institutes of Health found that chronic stress induces B6 metabolic disorder through gut dysbiosis, contributing to stress-related neurological changes, and that B6 supplementation during chronic stress alleviated these stress-related outcomes.

B6 is also a critical cofactor in the regulation of homocysteine, an amino acid that accumulates when methylation is under strain. Elevated homocysteine is associated with increased inflammation and mood changes in research populations.

Vitamin B12: the methylation and energy cofactor

Vitamin B12 in its active methylcobalamin form supports the maintenance of the myelin sheath around nerve fibers and plays a central role in the methylation cycle that produces neurotransmitters. Under chronic stress, B12 is also a required cofactor for the metabolic pathways that convert food into cellular energy, which is why B12 insufficiency often shows up as cognitive flatness and physical fatigue before any other symptom.

Research published in the National Institutes of Health database documents the role of sustained B12 status in nervous system integrity. Women who feel persistently cognitively flat or physically drained during a multi-week stress sprint, despite sleeping and eating reasonably well, often have B12 status at the lower end of the normal range rather than outright deficiency.

Vitamin D: the stress-mood connection

Vitamin D functions more like a hormone than a traditional vitamin, with receptors across the brain and body. Its relationship with stress and mood is increasingly well documented. Research published in PubMed found that international literature strongly correlates sufficient Vitamin D levels with comprehensive mental well-being in women, and that the link is tied to neurobiological pathways involving serotonin metabolism and hormonal fluctuations.

A cross-sectional study published in PLOS ONE via the National Institutes of Health found an inverse relationship between serum Vitamin D concentrations and allostatic load, a cumulative measure of biological stress. In plain terms: the higher the stress burden, the lower the Vitamin D status tended to be. Whether this is a causal relationship or a correlational one is still being studied, but the pattern is consistent enough across research populations to make Vitamin D status relevant to a discussion of what the body needs during a sustained stress sprint.

"I think so many things can be avoided if there's just prevention."

— Dr. Samantha Ess, ND, Naturopathic Doctor specializing in hormone health and fertility

How to replenish these nutrients effectively

Form matters as much as dose for all three. For B6, the active pyridoxal-5-phosphate form does not require conversion and is immediately available for neurotransmitter synthesis. For B12, methylcobalamin is the active form that supports the methylation cycle directly. For Vitamin D, D3 (cholecalciferol) is the form the body synthesizes from sunlight and the form most effectively used in supplementation.

"Every Pink Stork product is not only backed by science, it's also covered in prayer."

— Amy Suzanne Upchurch, Founder and CEO of Pink Stork

Pink Stork's Cortisol Complex, a daily adaptogen blend for stress support, provides B6 as Pyridoxal-5-Phosphate, B12 as Methylcobalamin, and Vitamin D as Cholecalciferol, all in their active forms, alongside 300 mg organic ashwagandha root, chamomile, saffron, and algae-sourced DHA.† The full formula supports a healthy stress response and a calm, balanced mood in a single daily serving. It is vegan, non-GMO, gluten-free, and cGMP-certified.

For women who are also looking to support working memory and cognitive energy during the stress sprint, pairing Cortisol Complex with our micronized creatine with just one ingredient supports the phosphocreatine-ATP system in brain tissue.†

For the full guide on what Maycember does to the body: What Is Maycember and What Does It Do to Your Body?

For the neurochemistry of the mental load: What Happens to Your Brain During a Sustained Stress Sprint?

Pink Stork products are ISO 17025 third-party tested and available at Target, Walmart, and CVS.

Frequently asked questions

Which nutrients are depleted most by chronic stress?

Vitamin B6, Vitamin B12, and Vitamin D are among the first to be depleted under sustained stress. B6 and B12 are required for neurotransmitter synthesis and are used more rapidly under high nervous system demand. Vitamin D has a documented inverse relationship with stress burden in research populations.

Why do B vitamins matter so much under stress?

B6 and B12 are required cofactors for the synthesis of GABA, serotonin, and dopamine, the neurotransmitters most directly involved in calm, mood, and cognitive regulation. When these vitamins are depleted, the brain's ability to produce these neurotransmitters is compromised, producing the mood flatness, irritability, and cognitive difficulty that characterize sustained stress periods.

What is the difference between P5P and regular B6?

Pyridoxal-5-phosphate (P5P) is the active form of B6 that the body uses directly. Standard pyridoxine, the most common supplement form, requires conversion by the liver before it can be used. For women under stress whose digestive and metabolic efficiency may be compromised, P5P provides more reliable access to the active form.

Can I get enough of these nutrients from food during a stress sprint?

In theory, yes. In practice, the combination of increased demand and decreased absorption efficiency during sustained stress makes it harder to maintain sufficient status from diet alone, even with good eating habits. Supplementation in active forms provides a more direct route to replenishment during high-demand periods.

Does Vitamin D really have anything to do with stress?

Research documents an inverse relationship between Vitamin D status and stress burden, and Vitamin D has known roles in serotonin metabolism and immune function. While the exact causal direction is still being studied, sufficient Vitamin D status is consistently associated with better mood and stress resilience outcomes across research populations.

How quickly do these nutrients deplete under stress?

B6 and B12 are water-soluble and used continuously, so depletion during high-demand periods can be relatively rapid, measurable over days to weeks rather than months. Vitamin D is fat-soluble and stores more slowly, but chronic stress patterns and indoor lifestyles (especially during high-demand work periods) can create a widening gap over time.

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.