What Is Pyroluria? Causes, Symptoms and What to Look For

What is Pyroluria?

Pyroluria, also known as Pyrrole Disorder, Kryptopyrrole, Kryptopyrroluria, Mauve Factor and Hemepyrrole, is often described as a mental health condition. In reality, it relates to the abnormal synthesis and metabolism of haem-containing molecules in the body.

A natural process in the body is the breakdown and removal of waste by-products. Haem-containing cells — including haemoglobin, myoglobin, catalase, and the cytochrome enzyme system — all produce hydroxyhemopyrrolin-2-one (HPL), also known as pyrroles, as part of this process.

In individuals with Pyroluria, higher amounts of HPL are produced. These pyrroles bind to key nutrients such as zinc, vitamin B6 and biotin, increasing their loss through urine and interfering with how well they can be used by the body. [1] [2]

Over time, this ongoing loss can place pressure on the nervous system, energy production, and the body’s ability to handle stress, which is why symptoms often build gradually rather than appearing all at once. Levels of the semi-essential fatty acid GLA may also be reduced.

In this situation, a general supplement is often not enough. A more targeted approach — replacing the nutrients most affected and most heavily used — tends to be more effective.

Zinc and vitamin B6 are essential cofactors in the manufacture of the body’s antioxidant enzyme system, including glutathione, catalase and superoxide dismutase. These enzymes act as part of your internal defence system, helping to protect your cells from damage. When HPL interferes with these nutrients, it reduces the body’s ability to protect against oxidative stress and free radical damage. [2]

Oxidative stress is essentially a build-up of damage within the body. Over time, this can affect energy levels, recovery, and place strain on multiple systems, particularly the nervous system.

Antioxidants help protect cells by neutralising free radicals. Vitamin C is a well-known example — it works by donating an electron to stabilise these unstable molecules. One vitamin C molecule can deactivate a single free radical, but when the body’s antioxidant enzyme system is functioning well, it can neutralise large amounts in one go.

For those with Pyroluria, supporting antioxidant activity becomes an important part of the overall approach. This is where targeted support, such as antioxidants, can play a useful role.

Watch this — it’ll help you connect the dots quickly:

Signs and Symptoms of Pyroluria

Zinc, vitamin B6 and biotin play a role in many key functions throughout the body. When levels are even slightly reduced, it can affect multiple systems — which is why the signs and symptoms of Pyroluria can vary so widely from person to person.

Rather than presenting as one clear issue, it often shows up as a pattern of seemingly unrelated symptoms affecting mood, energy, digestion, and the way the body handles stress.

These nutrients are essential for proper function of the brain, nervous system, digestive system, and immune system. When they are depleted, the effects are not isolated — they can be felt across many areas of health.

Below is a list of some of the more commonly reported signs and symptoms associated with Pyroluria. [2]

For a full list of signs and symptoms associated with Pyroluria, please click here.

Does This Sound Like You?

Reading through a list of symptoms can feel overwhelming — and for many people, it’s not just one or two things, it’s a pattern that’s been building over time.

What we often see is someone who struggles more with stress than they should, feels easily overwhelmed, and takes longer to settle once their system has been pushed. Sleep may not feel fully refreshing, mood can shift quickly, and there’s often a sense that the nervous system is running a bit too high.

If that pattern feels familiar, it’s usually a sign there is something deeper going on — not just a random collection of symptoms.

If this is sounding familiar, this explains what’s actually going on:

Conditions Associated with Pyroluria

In addition to the various signs and symptoms, there are certain conditions and patterns more commonly seen alongside Pyroluria.

The list below outlines some of the conditions associated with elevated HPL levels, along with the percentage of individuals affected. [2]

For a full list of conditions associated with Pyroluria, please click here.

Read our blog on the 9 most Common Pyroluria Symptoms.

Unusual Body Signs Associated with Pyroluria

Some individuals with Pyroluria may also notice changes in physical appearance.

Below are some of the more commonly observed body signs associated with elevated HPL levels. [2]

For a full list of body signs associated with Pyroluria, please click here.

What Causes Pyroluria?

In most cases, Pyroluria does not develop in isolation — it is driven by a combination of factors that increase stress on the body and demand for key nutrients.

What we commonly see is a pattern building over time, where ongoing stress, poor diet, digestive issues, and lifestyle habits gradually push the system further out of balance.

These factors can increase pyrrole production, interfere with nutrient absorption, and make it harder for the body to keep up with demand.

These are some of the most common factors we see contributing to elevated HPL levels and worsening symptoms:

• Research discovered that stress increases the production of HPL. [2]
• An unpublished US navy study conducted in 1992 found a very rapid increase in HPL levels in male volunteers who were subjected to the stress of a brief cold-water immersion. [2]
• Poor dietary choices and poor digestive health can lead to an increase in HPL levels. [2]
• Studies have shown that zinc deficiency increases bowel permeability leading to a condition known as Leaky Gut Syndrome. [3] [4] [5]. Leaky Gut Syndrome increases HPL in susceptible Pyroluria sufferers.
• It is a well-known fact that stress damages the intestinal wall and causes intestinal inflammation. Both of which lead to an increase in Leaky Gut Syndrome, Dysbiosis and worsening of Pyroluria Symptoms. [6], [7]
• Dysbiosis, an overgrowth of detrimental bacteria in the intestinal tract, has also been linked to an increase in blood HPL levels, which indicates Pyroluria. Dysbiosis is also a significant cause of Leaky Gut Syndrome. [2] [8] 
• Stress can quickly worsen gut balance, increasing the adherence of harmful bacteria to the intestinal wall and driving symptoms further. [9]
• Alcohol, smoking, drugs and heavy metal exposure dramatically increase blood HPL levels. This is why sufferers of Pyroluria tend to get a worsening of their symptoms 24 to 48 hours after a big night on the town or recreational drug use.
• For more information on What Causes Pyroluria

Is Pyroluria Curable?

In many cases, this pattern can be improved significantly once the underlying drivers are addressed.

Pyroluria is often described as either genetic or influenced by lifestyle factors. In practice, what we commonly see is a pattern driven by stress, diet, digestive health, and overall nutrient demand.

These factors can increase the production of pyrroles, place greater demand on key nutrients, and gradually make symptoms more noticeable.

Even in people where this pattern appears to run in families, addressing stress, improving diet, and supporting digestive health can make a substantial difference. In many cases, follow-up testing shows levels moving back toward borderline or even normal ranges.

Targeted nutrient support still plays an important role, particularly early on, helping to restore depleted levels and stabilise the system. This is where supplements such as Pyrrole Support Capsules and Antioxidant Support can be useful as part of a broader approach.

From there, identifying and addressing the underlying drivers — such as stress load, gut health, and dietary habits — becomes the key step in longer-term improvement.

How to Test for Pyroluria

Pyroluria is typically assessed using a urine test that measures levels of hydroxyhemopyrrolin-2-one (HPL), sometimes referred to as kryptopyrroles. This is currently the most recognised way to confirm whether elevated pyrroles are present.

Because HPL is sensitive to light, heat, and time, the accuracy of the result depends heavily on correct sample handling. The urine sample is usually collected in low light, protected from exposure, and kept cold or frozen before being sent to a laboratory for analysis.

Results are generally reported as negative, borderline, or elevated. While testing can provide useful confirmation, it is not always essential to begin support. In many cases, the overall pattern of symptoms, history, and contributing factors can provide enough direction to start addressing the underlying drivers.

If you’re unsure whether testing is right for you, or where to start, we focus on helping you understand the pattern as a whole — including stress, diet, digestion, and lifestyle factors — and guide you through a targeted plan based on your individual presentation.

Why Pyroluria Is Often Overlooked

Pyroluria is not widely recognised in conventional medicine, which can make it difficult for some people to find clear answers.

Part of the reason is that it does not fit neatly into a single diagnosis and is not typically addressed with standard medical treatments. Instead, it sits more within the area of nutritional and functional health, where factors such as nutrient status, stress, and digestive health are considered together.

There is also a large amount of conflicting information available online, which can make it hard to know what to trust. This often leads people to dismiss the pattern altogether or miss the underlying drivers.

If this is something you’ve come across and are unsure about, it can be helpful to look at the full picture — including symptoms, lifestyle factors, and overall health patterns — rather than relying on a single viewpoint. You can also explore more on whether Pyroluria is a myth, and what approaches are available to better understand and address it.

How Elevated Pyrroles Affect the Body

• Pyrroles (HPL) can interfere with normal nerve function and, in higher amounts, may place stress on nerve cells. [2]
• HPL can reduce haem levels. Animal studies have shown decreases in liver haem and its associated detoxification enzyme, cytochrome P450, by up to 55% within 48 hours. [10]
• Haem plays an important role in cellular energy production, particularly in nerve tissue. Lower levels can impair normal cellular function and place stress on the nervous system. [11] [12]
• Zinc, vitamin B6 and biotin are all required for haem production. When these nutrients are depleted, haem levels may drop further. [13] [14]
• Stress and heavy metal exposure can further impact haem levels and worsen this pattern. [2]
• Low haem levels may contribute to increased production of nitric oxide, a reactive molecule that, in excess, can place strain on brain tissue. [15] [16]
• The body relies on antioxidant enzymes such as glutathione, catalase and superoxide dismutase to protect against cellular damage. These systems depend on adequate levels of zinc and vitamin B6.
• Low vitamin B6 levels are associated with reduced glutathione production and may impact cellular energy systems. [17]
• Catalase, one of the key antioxidant enzymes, requires haem for its structure. Lower levels have been observed in certain neurological conditions. [18] [19]

What To Do Next

If this has helped you better understand what may be driving your symptoms, you’re not alone — this pattern is more common than most people realise.

The information provided in this blog is for educational purposes only and is not intended to diagnose, treat, or replace personalised healthcare advice. If you have any health concerns, we recommend seeking guidance from a qualified healthcare professional.