Educational only. Not medical advice.

Vitamin C and the Stress Response

Vitamin C is widely used to support immunity, allergies, and overall wellness. Research also suggests it may help reduce both the physical and psychological effects of stress.

According to an article summarized in the October 2, 2002 issue of Psychology Today, people with higher vitamin C levels in their blood show fewer mental and physical signs of stress when faced with acute challenges. They also tend to recover more quickly afterward.

Human Studies

In one study from German researchers, 120 adults were asked to deliver a public speech and complete difficult math tasks. Half received 1,000 mg of vitamin C, and half did not.

Participants who did not receive vitamin C produced:

  • higher cortisol levels

  • higher blood pressure

  • greater feelings of stress

Those given vitamin C reported that they felt less stressed and showed a more moderated physiological response.

Earlier research also suggests that vitamin C may influence adrenal hormone output. Elevated cortisol is part of the “fight or flight” response, but chronically high cortisol can affect learning, memory, immune function, blood pressure, and mood.

Findings From Animal Studies

Animal models offer similar results. In rats exposed to repeated stress, vitamin C supplementation:

  • prevented the typical rise in cortisol

  • reduced signs of physical and emotional strain, including weight loss

  • lowered stress hormone levels to one-third of those seen in unsupplemented animals

These studies suggest that vitamin C may help buffer the stress response, though more human research is needed.

Vitamin C in the Diet

It is likely that early human diets contained far more vitamin C than modern diets provide. Today’s Recommended Dietary Allowance (RDA) is only 60 mg, although many natural-health experts believe this may be lower than optimal for some individuals.

Vitamin C is abundant in fresh produce. Very little vitamin C is found in meat or poultry, and only small amounts occur in raw fish. Because vitamin C is heat-sensitive, cooking and prolonged light exposure can significantly reduce levels.