A manager leading thirty people found herself, three years ago, aching and swollen all over, her feet too puffy for her shoes, her abdomen so distended before her period that colleagues assumed she was pregnant, with rows of dyshidrotic eczema across her hands that itched her awake at night. She went from specialty to specialty, and every one told her the numbers were normal. She even had genetic testing done. It took a functional medicine panel before she could see the common source behind her mood and her skin going out of control together — not a problem with her temper, but her body asking her for something.
Why do bigger mood swings and recurring skin problems show up together?
In everyday life these two are usually handled separately. Unstable mood we put down to stress, an impatient personality, too much going on. Recurring skin we take to a dermatologist, change our skincare, review what we have been eating. Two separate tracks, and very few people look at them together.
From a functional medicine perspective, though, they may well share one source: nutrients that are being chronically drained away.
The reason is that mood regulation and skin repair are not two independent systems. The brain needs raw materials to make the neurotransmitters that settle us down; the skin barrier needs raw materials to repair itself and resolve inflammation. When a few key nutrients are being drained over a long period, both tracks run short at once — they just show it differently. One shows up as "I get irritated far too easily lately", the other as "it clears up here and breaks out there".
That was Helen's situation. She had lost thirty kilos back in her student days, and ever since could not let go of a 0.1 kg movement on the scale, holding herself to a standard close to zero tolerance. She had always assumed her quick temper was simply her personality — until the report was laid out in front of her and she saw that for years her body had been asking her for something.
What is kryptopyrrole, and why does it carry away zinc and vitamin B6?
Kryptopyrrole is a substance produced during the body's metabolism and excreted in urine. It is not a toxin in itself; the problem lies in how it leaves the body.
On its way out, kryptopyrrole grabs two things and takes them with it: vitamin B6 and zinc.1 This is an ongoing process. If kryptopyrrole is only occasionally elevated, the body has a chance to make the losses back; but if it stays high over the long term, both nutrients sit in a state of net loss — what goes in cannot keep up with what goes out.
Low vitamin B6 means less raw material for mood
B6 acts as a helper in the brain. Serotonin and GABA — the neurotransmitters responsible for settling us and keeping a foot on the brake — both need B6 in their production.2
So when B6 runs low over a long period, what a person feels is not "I am ill" but a shorter fuse. The same small thing you used to let go now sets you off; at night your thoughts will not stop; the swings in your mood are wider than you remember them being. That change is easily read as a personality problem or a stress reaction, because there is no clear symptom to point at.
Low zinc means the skin barrier cannot be rebuilt
Zinc takes part in over three hundred reactions in the body, among them skin barrier repair and immune regulation. When stores run low over time, repair cannot keep pace with damage.
The pattern it produces is distinctive: not one severe flare but something recurring and migratory. It clears here and starts there, worsens with the change of season, worsens under stress, improves for a while with a cream but never truly stops. Most people focus on "why did it flare this time", when the more revealing question is "why does it never fully settle".
This is also why one marker alone is rarely enough. Kryptopyrrole tells you the rate of loss, zinc and B6 tell you the current stores, and only the three together show whether the body is running a surplus or a deficit. Want to know where your kryptopyrrole sits? →
Why does every specialist say the report is normal?
Helen took her swelling to nephrology, her premenstrual discomfort to gynecology, her skin to dermatology. Every specialty's numbers fell inside the normal range, and none of them found a problem.
This is not a failure of care. Specialty medicine answers a very specific question: is this organ diseased. The threshold for interpretation is the threshold for disease, and below that line is normal. That logic is extremely effective at handling disease, but it was never designed to answer "why do I feel wrong".
And chronic nutrient depletion happens to cut across several systems at once. It does not push any single organ past the disease threshold, yet it is more than enough to send someone's day-to-day experience steadily downhill. Within a specialty framework this state has almost nowhere to land — every specialty is correct, and none of them is looking at it.
Seeing an imbalance that cuts across systems does not take a more precise single test; it takes putting nutrition, hormones, inflammation and metabolism side by side in one report. The Body Decode Core Panel covers 17 health categories and 136 physiological markers in one go, so numbers that were scattered across specialties — each one normal on its own — can finally be read against each other.
See what the panel covers →Three markers belong together; none of them means much alone
Kryptopyrrole, zinc and vitamin B6 need to be read together because each answers a different level of the question.
| Marker | What it answers | How to use it |
|---|---|---|
| Kryptopyrrole (urine) | How fast you are losing | An elevated level means B6 and zinc are being continuously carried away. Do not read this number alone; check it against your stores. |
| Zinc | Current stores on the skin and immune track | Especially worth checking if your skin keeps recurring. Watch the trend, not a single value. |
| Vitamin B6 | Whether the mood regulation track has enough raw material | Read alongside kryptopyrrole. Keep your own notes through periods of marked mood swings and compare them against the data when you re-test. |
Test kryptopyrrole alone and you know something is leaking but not how much has already gone. Test zinc or B6 alone and you see low stores without knowing whether you are eating too little or losing it continuously — and those two situations call for completely different responses. The first you can simply replace; with the second, no amount of supplementation will catch up until the loss is addressed.
It is also why re-testing after an adjustment matters. We suggest testing again three to six months later to see whether the numbers have genuinely moved back. Judging "am I any better" by feel tends to overestimate short-term change and to miss the real trend.
Once you can read the data: how to adjust eating, supplements, movement and sleep
Eat
Stop treating physical problems with "eat less". The first assignment Helen's dietitian gave her was one of her favorite soft-serve ice creams every week. The point was not indulgence but getting her body to stop treating every mouthful as a threat — prolonged restriction pushes the body into conservation mode, and before metabolism can come back, it has to feel safe.
Supplement
Do not take B6 and zinc on instinct. The order is look at the data, decide whether and for how long to supplement, then re-test to confirm. Supplements are one part of a strategy; a longer list is not a more effective one. Helen once spent over NT$15,000 a month on supplements, and before she saw her data she had no idea whether any of it was reaching what she was actually short of.
As for which form and how much, that needs assessment by a professional based on your own data and health status, and generic advice from the internet does not transfer.
Move
Start with something that feels good. Helen's first run had a coach alongside her from start to finish; she enjoyed it, and that was why there was a second one. Only once she genuinely wanted to push did she switch to a coach who made her work. The hardest part of exercise has never been the intensity — it is making it something you do not have to steel yourself to begin.
Sleep
She used to wake at two, and sleep aids gave her relentless nightmares; now she is out by ten and wakes naturally at six. Sleep is the shared foundation of both mood and skin repair, and it should be protected first rather than squeezed — any dietary or supplement adjustment delivers less when sleep is short.
The questions people ask most about kryptopyrrole, mood and skin
How is kryptopyrrole tested?
A urine test. Kryptopyrrole is excreted in urine, so the sample is urine rather than blood. Follow the preparation instructions supplied with the test; fasting is usually not required.
Does elevated kryptopyrrole mean I am ill?
No. It is a marker reflecting a state of loss, not a diagnosis. An elevated value means vitamin B6 and zinc are being continuously carried away, which is a prompt to assess the stores of both — not a conclusion. For the actual reference range, go by the figures printed on your own report, as laboratories differ.
Do big mood swings always mean a nutrient shortfall?
Not necessarily. Mood is shaped by many factors — stressful events, sleep, hormonal cycles, changes in life circumstances. Nutritional status is one line worth checking, particularly when mood changes and skin problems appear together with no clear cause. If mood is already affecting daily life, we suggest seeking psychiatric or psychological support.
I take a B complex and zinc — why do I feel no different?
Two common possibilities. One, the amount you are taking cannot keep up with the rate of loss — in which case the loss has to be addressed rather than the dose endlessly increased. Two, what you are short of is not only these two, or not these two at all. That is why we suggest looking at the data before supplementing: with a baseline, you can tell whether you are taking the right thing and whether it has come back.
How often should recurring skin problems be re-tested?
We suggest every six months. Neither skin repair nor nutrient stores change on a weekly timescale, and testing too frequently obscures the trend behind normal fluctuation. It took Helen around three years from starting to adjust until her data stabilized.
Does the Body Decode Core Panel include kryptopyrrole analysis?
The Body Decode Core Panel (136 markers) does not include kryptopyrrole. If you want to track the rate at which you are losing zinc and vitamin B6 at the same time, kryptopyrrole analysis can be added on separately.
Turn "something is off and I cannot say what" into data you can read
If mood swings and recurring skin problems have been showing up together for a while, and every specialty's report says normal —
the Body Decode Core Panel covers 17 health categories including nutrients, metabolic, cardiovascular, detoxification, endocrine and immune, with 136 physiological markers, plus an online consultant report review of 40 minutes or more and a 120-day action plan.
1. McGinnis WR, et al. (2008). Altern Ther Health Med.
2. Kennedy DO. (2016). Nutrients, 8(2), 68.
This article explains general physiological mechanisms and is not a diagnosis or medical advice. Actual values require testing and interpretation by a professional based on your individual situation.
