Episode #381: How a Supplement Sent a Soldier to the Hospital- A Medical Mystery

Summary

This episode presents a medical mystery involving a 23-year-old active-duty soldier who presents with acute kidney failure, severe hypertension, and agonizing jaw pain. Despite appearing fit and muscular, his body began failing after he followed common gym advice to “optimize” his hormones. Dr. Feigenbaum and Dr. Baraki walk through the differential diagnosis, the dangerous physiological consequences of severe Vitamin D toxicity, and the persistent myth that high-dose supplementation is a “natural” shortcut to increased testosterone.

🎧 Listen on Apple Podcasts: https://podcasts.apple.com/us/podcast/episode-381-how-a-supplement-sent-a-soldier/id1199780143?i=1000743421069

Key Takeaways

• Vitamin D is Not a Testosterone Booster: totality of human evidence, including multiple meta-analyses, shows that Vitamin D supplementation has no significant effect on testosterone levels in non-deficient men. Chasing lab numbers with “natural” supplements can lead to severe clinical harm.
• The Danger of Fat-Soluble Vitamins: Unlike water-soluble vitamins (C, B-complex), Vitamin D is stored in adipose tissue and has a long half-life. Toxicity can take months or even years to resolve, as seen in this case where levels remained elevated six months after cessation.
• Metastatic Calcification: Chronic hypercalcemia can turn flexible arteries into rigid, lead-pipe structures via calcium phosphate deposition. This leads to structural hypertension that may persist even after kidney function and calcium levels normalize.
• Updated Endocrine Guidelines (2024): The medical community has moved away from routine Vitamin D testing and universal targets (e.g., 30 ng/mL) for healthy adults under 75. Chasing a specific number often carries more risk and cost than benefit for the general population.
• The “Natural” Blind Spot: Patients often do not categorize supplements labeled as “natural” or “healthy” as medications. Clinicians must specifically ask about over-the-counter and gym-related products during medical reconciliation to avoid missing critical diagnostic clues.

Episode Timestamps

• [00:00] Introduction to the Case: The Fit Soldier’s Failure
• [01:07] Welcome and Mystery Case Framework
• [02:05] Patient History: The River and the GI Symptoms
• [03:53] Building the Differential: Infection vs. Dehydration
• [08:20] Initial Workup and the Hypercalcemia Discovery
• [14:14] The Medical Student’s Reveal: Supplement Reconciliation
• [18:05] Final Diagnosis: Severe Hypervitaminosis D
• [22:20] Metastatic Calcification and Permanent Vascular Damage
• [25:23] The Mechanism of Jaw Pain: Bone Resorption
• [28:34] Science Review: Debunking the Pilz (2011) Study
• [32:27] Fat-Soluble vs. Water-Soluble Risks
• [43:06] The Free Vitamin D Hypothesis
• [48:06] Updated 2024 Endocrine Society Guidelines
• [55:16] Final Thoughts: Vitamin D and the Endurance Population

Clinical Pearls

Pearl 1: The Testosterone Myth

The engine behind this entire case was the belief that Vitamin D is a “pro-hormone” for testosterone. As we mentioned, multiple recent meta-analyses have shown that Vitamin D supplementation has no significant effect on testosterone levels in men regardless of their initial T or vitamin D levels. Whether you’re vitamin D deficient or not, taking 10,000 IU a day isn’t going to turn you into a pro bodybuilder; it’s just going to turn your blood into a calcium soup.

Pearl 2: Dosing Confusion (IU vs. mcg)

One of the most dangerous things in the supplement aisle right now is the labeling. In 2020, the FDA began requiring manufacturers to list Vitamin D in micrograms (mcg) rather than just International Units (IU).

• The Math: 1 mcg equals 40 IU.
• If a patient sees a bottle that says “125 mcg” and they think it’s a small number, they may not realize they are actually taking 5,000 IU per serving. If they “double up” because they feel tired, they are suddenly in that 10,000 IU toxicity range.

Austin, as an IM doc, how often are you seeing patients come in who are technically overdosing simply because they can’t read the back of the bottle?”

Pearl 3: The Fat-Soluble “Trap”

Unlike Vitamin C or B-vitamins, where you essentially just “pee out” the excess, Vitamin D is fat-soluble. It stores in your adipose tissue and has a lomg half-life. Our soldier in this case still had elevated levels six months after he stopped taking the pills. If you overdo it, you can’t just “detox” it out in a weekend; you are stuck with those levels for a long, slow recovery.

A 2024 review in Endocrine Reviews by Bouillon and colleagues explains the molecular “why” behind this soldier’s crisis.

When we talk about Vitamin D, we usually just look at the total number on the lab report.But this paper highlights the “Free Vitamin D” hypothesis. Most of our Vitamin D is carried around by a specific transport protein called Vitamin D Binding Protein,. Think of it like a taxi service for the hormone.

As long as the Vitamin D is in the taxi, it’s mostly sequestered and safe. But our patient was taking 10,000 units a day for six months. He essentially saturated every single “taxi” in his bloodstream.

Austin, help us understand the ‘Taxi’ situation. We spend so much time talking about the left side of the curve—the deficiency side—but our patient is the poster child for the right side.

when we look at this from a molecular level, why is it so dangerous to overwhelm these binding proteins, and how does this change how we should interpret a standard “Total Vitamin D” lab test

Once those binding proteins are 100 percent saturated, the Vitamin D starts spilling over as “Free Vitamin D.” This is the active, unbound form that enters cells unregulated. This is what triggered that massive, uncontrolled calcium absorption and the bone resorption that caused his jaw pain.

Pearl 4: Vitamin D Guidelines

To close out this discussion, we should look at the updated clinical practice guidelines from the Endocrine Society, which marks a significant shift in how many approach vitamin D.

For years, many in the fitness and medical communities have operated under the assumption that we should be testing everyone and aiming for a specific number, usually 30 nanograms per milliliter. These new guidelines move us away from that “treat-to-target” model and toward a more nuanced, evidence-based approach.

Here is the breakdown of what the experts now recommend for the general, healthy population:

Recommendations for Supplementation

First, for children and adolescents aged 1 to 18, the panel suggests vitamin D supplementation. This is primarily to prevent nutritional rickets and because there is some evidence it may lower the risk of respiratory tract infections.

Second, for pregnant individuals, empiric supplementation is suggested. The data indicates potential for lowering the risks of preeclampsia, preterm birth, and neonatal mortality.

Third, for adults with high-risk prediabetes, the guidelines suggest supplementation in addition to lifestyle modifications to reduce the risk of progression to type 2 diabetes. In the trials reviewed, the weighted average dose was around 3500 units per day.

Fourth, for adults aged 75 and older, empiric supplementation is suggested due to a potential mortality benefit identified in the meta-analysis.

For healthy adults between the ages of 19 and 74, the panel suggests against routine supplementation beyond the current Dietary Reference Intakes, which are 600 to 800 units per day.

The Shift in Testing and Thresholds

Perhaps the most significant change is the recommendation against routine 25-hydroxyvitamin D testing. The panel suggests against screening the general population, including those with obesity or dark complexion, if they are otherwise healthy and do not have established medical indications like hypocalcemia or malabsorption.

Importantly, the Endocrine Society no longer endorses a universal target level of 30 nanograms per milliliter for “sufficiency.” They’ve acknowledged that the evidence does not support a single threshold for all people and all conditions. The costs and burdens of widespread testing often outweigh the benefits, especially when a safe, empiric dose is inexpensive and accessible.

“The Endocrine Society just flipped the script on the 30 ng/mL target. Austin, for years we were told ’30 is the floor.’ Why did the medical community move away from that target, and how do you talk to a patient who is worried because their lab result says 28?

Dosing Strategy

When supplementation is indicated, the guidelines strongly prefer daily, lower-dose administration over intermittent, high-dose “bolus” therapy—like those 50,000 or 100,000 unit doses given once a week or month. Intermittent high doses may actually increase the risk of falls and fractures in certain populations, while daily dosing mimics natural physiology more closely.

References

• https://pmc.ncbi.nlm.nih.gov/articles/PMC9478588/
• https://link.springer.com/article/10.1007/s12020-020-02482-3
• https://pubmed.ncbi.nlm.nih.gov/32446600/
• https://pubmed.ncbi.nlm.nih.gov/21154195/
• https://academic.oup.com/jcem/article/109/8/1907/7685305?login=false
• https://academic.oup.com/edrv/article/45/5/625/7659127
• https://academic.oup.com/milmed/article/189/1-2/e417/7218964 

Transcript

The patient is 23 years old. He is active-duty military, stationed at a base where physical readiness isn’t just a requirement; it’s part of the culture. He’s muscular, he’s conditioned, and by all outward appearances, he’s a physical specimen. But for two weeks, something’s been deeply wrong. It started with nausea, then the vomiting, then a persistent, agonizing pain in his jaw that felt like his teeth were being pulled out.

He assumes it’s a bug. He had been swimming in a freshwater river recently, so maybe he caught a parasite, and he tries to work through it on his own. He takes nearly a dozen aspirin a day just to keep the jaw pain quiet enough to function. When he finally walks into a civilian urgent care, the nurse takes his blood pressure. It’s 180 over 110, way too high. Then they run a quick chemistry panel and they find out his creatinine is 3.5. His kidneys are shutting down, basically.

This 23-year-old soldier is rushed to a hospital. The doctors are looking for infections. They’re looking for rare diseases from the river, and they’re looking for kidney stones. But the answer wasn’t in the water. It was in a conversation he had with a guy at the gym about six months ago.

Welcome back to the Barbell Medicine Podcast, where we bring modern medicine to strength and conditioning and strength and conditioning to modern medicine. I’m your host, Doctor Jordan Feigenbaum, and today I’m joined, as always, by the second most handsome doctor in North America, Doctor Austin Baraki. Austin, we’re ending the year with something a little different. We’ve been hitting the science hard on peptides, injuries, and sarcopenia. But today I’m bringing you a mystery case. I’ve got the history and physical. I’ve got the labs, I’ve got the imaging, and I have a patient who on paper should have been at the peak of his health. You’re going to be the attending on this one. I’m going to give you the data as it arrived at the bedside, and we’re going to see if you can figure out why this healthy young soldier’s body started failing.

Our patient arrives at the hospital. He is a well-appearing soldier, 23 years of age, and again, he looks well, which is the first weird thing, because you’d expect someone who’s been throwing up for two weeks to look sick, but he doesn’t. In fact, his biggest complaint is persistent, severe jaw pain. He tells you that two weeks ago he went swimming in a freshwater river. Shortly after that, the GI issues started with nausea, vomiting, and diarrhea. About a week ago, he started having severe, unrelenting jaw pain, which is what prompted him to seek care. He’s been using about eight tabs of aspirin and 400 milligrams of ibuprofen at a time for about one week, but he continues to have pain.

He previously went to an urgent care center earlier this day because he was unable to keep anything down and his jaw pain went to ten out of ten. They found a creatinine of 3.5 and his systolic blood pressure was in the 180s. They subsequently turfed him to your hospital. Naturally, the first thought in the E.R. was that he was hypovolemic. They thought he was dehydrated from acute colitis or some other waterborne pathogen he picked up in the river. But here’s the first data point that breaks that theory: he tells you he’s been drinking six liters of water per day and he’s peeing a lot of clear urine, which was confirmed in the emergency department.

Austin, we have this young soldier with what looks like acute renal failure and massive hypertension. The initial history points to a river-borne infection or dehydration, but he’s apparently euvolemic and producing tons of dilute urine. When you see a young, fit guy with a blood pressure of 180 over 110 and his kidneys are tanking in the context of severe jaw pain, how do you go about building your differential? Are you looking at the river or is your mind going somewhere else?

This is super interesting. I was not expecting most of what you laid out there. The initial exposure of vomiting for two weeks after swimming suggests a pathogen, but someone severely dehydrated generally isn’t coming in with a blood pressure in the 180s. That was an immediate contrary data point. The creatinine of 3.5 could be explained by all the NSAIDs he is using, but I won’t lock in 100 percent on that because certain tropical infections like leptospirosis can cause a GI syndrome and lead to kidney failure.

The blood pressure is actually the least of my concerns right now. I get concerned when blood pressure is way too low or if it is the direct cause of problems, like an aortic dissection. Sometimes when patients are actively retching against a blood pressure cuff, it can make the readings falsely high. I’m tracking the creatinine, but focusing on the jaw pain because it is super localizing and it is the most severe symptom the person is reporting. He doesn’t feel his creatinine or his blood pressure, but he feels that jaw pain. I want to interrogate that further with imaging. Is it an infection, an abscess, or a fracture?

It is also very odd that he reports drinking six liters of water per day and putting out a lot of dilute urine. This raises concerns about diabetes. Most people know about diabetes mellitus related to blood sugar, but there is also diabetes insipidus where people are spontaneously peeing out too much dilute urine and having to drink to keep up. I’m focused on the jaw right now as the lead point to make progress.

The team runs the workup. They do urinalysis, infectious titers, and an autoimmune panel. They do imaging of the jaw, repeat the blood chemistry, and do a renal ultrasound. Almost everything comes back normal. He has no casts, no crystals, and no dysmorphic cells in the urine. The renal ultrasound is clean. His aldosterone to renin ratio is normal, ruling out secondary causes for hypertension. His creatinine is still 3.5. The patient is in agony, requesting opioids just to sit still. No fracture is seen on imaging of the jaw. His morning labs show that his calcium is starting to climb. They did a trial of fluid restriction, but his calcium was 13.7 in the morning.

Austin, why does this young soldier have a calcium of nearly 14, and how could this tie back to his severe jaw pain? What’s your next move?

Hypercalcemia among all comers makes me ask how high it is. Mild elevations can be simple dehydration, but nearly 14 changes the differential. I want to know about his parathyroid hormone (PTH). Is he inappropriately producing too much, or is this calcium high despite having normal parathyroid function? Getting a PTH level is the next step. My guess is it will be appropriately suppressed.

If it is PTH-independent, does this patient have Vitamin D toxicity? Is he taking too much supplementation or does he have a medical condition leading to excessive activation of Vitamin D? Finally, is he taking some form of calcium supplementation? If he was taking boatloads of Tums to try to relieve symptoms from NSAID-induced reflux, he could make himself hypercalcemic. High blood calcium leads to nephrocalcinosis and diabetes insipidus, which explains the kidney failure, peeing a lot, and drinking a lot. The jaw pain is still the outlier, as high calcium related to bone disease can lead to pathologic fractures, but you told me there were no fractures.

Just to review, the parathyroid hormone level was just five, which is appropriately suppressed. This rules out something growing on the gland. They ordered a chest X-ray to look for enlarged lymph nodes that might point toward sarcoidosis, which can ramp up Vitamin D levels, but the X-ray was clear. Doctors were considering a kidney biopsy, but before they did, they sent a medical student back into the room for a medical reconciliation. The patient previously denied taking steroids, but the student changed the framing and asked if he was taking anything natural or healthy over the counter. The soldier says he is bulking and taking a multivitamin, B12, and one specific supplement he heard about at the gym to maximize natural testosterone production.

Austin, this is your final clue. The patient is taking an over-the-counter supplement in high doses because of a gym myth. Combined with the suppressed PTH, sky-high calcium, and agonizing jaw pain, what is your final diagnosis?

Sarcoidosis or granulomatous diseases can lead to over-activation of Vitamin D. The fact they were considering a kidney biopsy is interesting; I wouldn’t have been in that space since the urinalysis was benign. If I think through what leads to high calcium, there are blood pressure medicines like thiazides or things like lithium and Vitamin A. I would be doing some searching for what testosterone boosters could contribute. Zinc and Boron are common, but narrowing it down to the jaw pain is where I would need the patient to tell me what he is taking.

I am going to give you the final boss clue. The lab called the floor because they had to dilute the sample multiple times because the levels were off the charts. The serum 25-hydroxy Vitamin D level is unquantifiable, listed as greater than 200 nanograms per milliliter. The diagnosis is severe hypervitaminosis D. The patient reveals he has been taking at least 10,000 IU of Vitamin D every single day for the last six months. He was following advice from a friend who cited a misunderstood study suggesting Vitamin D could skyrocket testosterone. The team started aggressive fluid resuscitation and his calcium began to drift down.

Vitamin D is fat-soluble and can accumulate quite a bit. This can last a long time before it gets better. Sometimes these patients are put on glucocorticoids like prednisone to reduce the risk of hypercalcemia. If this guy was hoping to get jacked and instead required prednisone, he really shot himself in the foot because he ended up on a catabolic steroid to survive the toxicity.

A month later, his creatinine was still 2.09. The kidneys were caught in a perfect storm of massive Vitamin D overload and high calcium, made worse by the aspirin and ibuprofen which further restricted blood flow. Three months later, his creatinine was down to a healthy baseline of one. Six months later, his Vitamin D was still at 80, showing just how long it stays in the system. But even after his kidneys recovered, he remained hypertensive. It seems high calcium levels for six months act as a slow-moving toxin for blood vessels. Calcium phosphate salts deposit in the tunica media of the arterial walls, known as metastatic calcification. Normally, arteries are like high-quality rubber hoses; now they were more like lead pipes.

Austin, the soldier recovered his kidney function but stayed hypertensive. What does the clean-up look like over the next 12 months?

Your hypothesis about the blood pressure is a little challenging to prove. I’d be curious what his pressure was before all this. Systemic calcification at age 23 after a few months is a maybe for me. I see it more in patients with advanced vascular disease or dialysis patients where they get calciphylaxis. We would have to control his blood pressure using conventional strategies after ruling out other secondary causes. Really, it’s going to be time and letting his body do its job getting off these supplements.

Let’s talk about the jaw pain. Excess Vitamin D can actually drive bone resorption, aggressively pulling calcium out of the skeleton and into the blood. This explains the jaw pain as the physical sensation of his body stealing calcium from his own skeleton. The jaw is a site of very high bone turnover. In severe toxicity, people can develop brown tumors or focal areas of bone loss. It is possible the pain he felt was his own bone structure being chemically dismantled from the inside out, causing micro-fractures missed on routine imaging.

The jaw is an area of aggressive turnover. We see osteonecrosis of the jaw in patients on certain osteoporosis treatments. I haven’t heard of this from Vitamin D toxicity specifically, but if it is accelerating bone turnover, I find that a plausible mechanism. I am not surprised routine X-rays missed it, as those are done quickly to look for major emergencies. You would need a bone scan or nuclear medicine imaging to look for cell activity in the area.

One study that gets cited a bunch in natural testosterone circles is the Pilz study from 2011. It suggested Vitamin D increased testosterone from 300 to 380. However, it was a secondary post-hoc analysis of a weight loss study, not designed for testosterone. We are talking about only 54 people where outliers can skew the average. They also used an immunoassay, which is notoriously unreliable at low levels. Even if we take the increase at face value, it is not clinically significant. It didn’t change muscle protein synthesis, strength, or body composition. Three recent meta-analyses have essentially closed the door on this: Vitamin D is a total wash for testosterone.

Taking Vitamin D to boost testosterone is like trying to fix a car that won’t start by adding more gas to the tank. If the engine is the problem, adding fuel won’t make the car run. You’re just creating a fire hazard or, in our patient’s case, metastatic calcium deposition. Austin, why is Vitamin D different from water-soluble vitamins like C or B12?

Water-soluble vitamins last for a short period and are readily excreted. Fat-soluble vitamins get sequestered in our adipose tissue and can sit there for a long time. If you get toxic, it can be prolonged. I intentionally overdose people on thiamin in the hospital because the risk of being deficient is great, whereas the risk of giving too much is zero. I never do that with Vitamin D.

I get people trying to seek out natural measures to fix a problem like testosterone deficiency. They think stacking sleep, weight loss, and Vitamin D will add up to a significant change. But this is often done without an understanding of dosage and monitoring. If someone’s testosterone is zero, Vitamin D isn’t going to fix why it got there. We talk a lot about accurate diagnosis and root causes, while the biohacker space is often just trying to make the numbers look prettier with zinc and boron without being curious about how they ended up there.

Updated clinical practice guidelines from the Endocrine Society in 2024 mark a significant change. For years, people aimed for a target of 30 nanograms per milliliter. The new guidelines move away from that. For healthy adults between 19 and 74, they suggest against routine supplementation beyond current dietary reference intakes (600 to 800 IU per day). They also recommend against routine screening and testing for the general population. They acknowledge that the evidence does not support a single threshold for all people and all conditions.

Austin, why did the medical community flip the script on this 30 ng/mL target? How would you talk to a patient worried because their lab result says 28?

There has been a lot of murkiness around lab cutoffs. Blood Vitamin D levels often correlate with general health; as people get unhealthier, they go down. Chasing a target might not improve a real outcome a patient cares about, like quality of life or longevity. Insurers shouldn’t pay for widespread testing without stronger evidence. If a patient comes in with a level of 28, I elicit their concerns. Why was it checked? Was it a fishing expedition? If they have multiple sclerosis, I would have them supplement because there is better evidence there. If they say they want a testosterone boost, we have a conversation about sleeping 30 minutes extra a night instead.

The guidelines also prefer daily lower dose administration over intermittent high-dose bolus therapy like taking 50,000 IU once a month. High doses increase the risk of complications. For the average lifter, Vitamin D isn’t going to turn you into an elite powerlifter. It is a reminder that more isn’t better.

The case of the soldier is an interesting correlates to the ultra-endurance world. Those folks are at risk for bone stress injuries, especially in the context of low energy availability. That is a situation where I have advised some folks to take Vitamin D, under monitored situations. But that is usually for people with super high volumes of training, which does not include the average person doing three hours of conditioning a week.

That is a wrap on this medical mystery. If you enjoyed this format, let us know. Head to Barbell Medicine and check out our stuff. Please leave us a five-star rating and a review to help others find the show. I’m Doctor Jordan Feigenbaum, special shout out to Doctor Austin Baraki. We will see you on the next episode.