OK Capsule
← Back to blog
Clinical InsightsSeptember 3, 2026

The One Pack I Never Skip

By Dr Andrew Brandeis, Co-Founder & Chief Medical Officer, OK Capsule

The mineral pack is the one pouch I treat like a prescription, and the reason is not enthusiasm. It is arithmetic.

I skip my supplements all the time. I know you do, too. I formulate packs for a living and yet I still skip them. Travel days, fasting days, days I simply forget. The nootropics, the adaptogens, the things I take because the mechanism is interesting and the downside is small, those may come and go.

The mineral pack does not. It is the one pouch I treat like a prescription and below I'll tell you why.

Our food is not the medicine it used to be.

Line illustration of mineral crystals, seeds, a leafy green, and a cut of meat

I built my early medical career on the idea that food is medicine, and the data says the medicine has been getting diluted for seventy years.

In 2004, Donald Davis and his team at the University of Texas compared USDA food composition data from 1950 and 1999 across 43 garden crops. Same foods, same database, fifty years apart. Grouped together, the crops showed statistically significant declines: calcium down 16%, iron down 15%, phosphorus down 9%. And Davis flagged something worse: the minerals we would most want to track, magnesium and zinc among them, were not measured in 1950 at all. We cannot even quantify what we lost because nobody wrote down the starting number.

A UK analysis found the same pattern in British produce from 1940 forward. Calcium, magnesium, iron, all trending down through the second half of the last century.

Davis didn't blame the soil first. His leading explanation was the dilution effect: we bred crops for yield, size, and pest resistance, and their ability to take up minerals did not keep pace with how fast we made them grow. The soil depletion story and the cultivar story both end in the same place, a carrot that carries less than the carrot your grandmother ate, but they are different mechanisms and the distinction matters. Soil can be remineralized. A tomato bred for shipping weight cannot be talked into stuffing extra magnesium into its pockets.

Either way, the conclusion holds: eating well in 2026 does not deliver what eating well delivered in 1950. The label on the tomato did not change. The tomato itself did. Unfortunately, we still have the same nutritional requirements as our grandparents.

The decline shows up in the population data

If crops carry fewer minerals, you would expect intake surveys to show people falling short. They do.

NHANES data from 2013 to 2016 found that 48 percent of Americans consume less magnesium than the Estimated Average Requirement. Not the optimal amount. Not the RDA. The EAR, which is the statistical floor, the intake below which half the population is by definition not getting enough. Nearly one in two Americans is under it for magnesium. Calcium runs a similar story, and a 15 year analysis of NHANES cycles published in 2024 confirmed that adults persistently underconsume calcium, magnesium, and potassium even when supplement use is counted.

These are intake numbers, not deficiency diagnoses, and I want to make sure that's clear. Being below the EAR does not mean you have clinical hypomagnesemia. It means your inputs are short and your body is managing the shortfall by borrowing, from bone in the case of calcium and magnesium, quietly, and for years. Serum levels stay normal right up until they don't. NHANES has not even measured serum magnesium since 1974. We stopped looking.

Why does the shortfall matter if nobody feels it? Because minerals are not nutrition in the soft sense, they are hardware. A large share of your enzymes require a mineral cofactor to run at all: magnesium alone participates in over 300 reactions, including every one that touches ATP. When the mineral is short, the body does not degrade gracefully across the board. It triages. It defends the functions that can kill you today, heart rhythm, nerve conduction, serum calcium, by borrowing from the functions that kill you in twenty years. Bone gets thinner so blood stays perfect. Immune response and tissue repair get deprioritized before anything you would notice. A deficiency you can feel is rare. A deficiency that is quietly compounding is, per the intake data, closer to a coin flip. That is the whole problem with subclinical: the absence of symptoms is not evidence of sufficiency, it is evidence that your triage system is working.

So what is actually in my pack?

Our pouches hold eight pills. I stuff mine full. If I am going to swallow a bag of pills, I want to make the most out of each swallow.

I added the products from this pack to our formulary one at a time, over years, as I researched what I believed was most lacking in the American diet. Research first, conviction second, bloodwork mostly absent. Two exceptions: vitamin D, where the population data is so lopsided that testing felt like a formality, and I tested anyway and was, like nearly everyone, low. And a DEXA scan I will get to. The rest of the pack is a set of educated bets on documented population gaps. It's not more precise than that, and I'm comfortable with that.

So here is what I take daily, and why. This is my personal protocol, not a recommendation for you. Different bodies, different diets, different answers.

Magnesium. The one I would keep if I could only keep one. Cofactor in over 300 enzymatic reactions, and the mineral with the worst intake data in the country. I use the glycinate form because magnesium oxide, the cheap default, mostly passes through you.

Zinc. Immune function, testosterone synthesis, wound healing, taste. Plant sources are compromised by phytic acid, which binds zinc before you can absorb it, one more reason I am becoming more vocal about antinutrients.

Calcium. This one I have a measurement for, and it is not flattering. A DEXA scan put my bone density in a low percentile for my age. Not a diagnosis, a trajectory, and one I intend to argue with. The 16 percent decline in the Davis data was calcium's number, and I would rather my skeleton not serve as the reserve account, especially as I age. I am not planning on getting either hip replaced.

Boron. The quiet one. Boron has consistent data suggesting it supports how the body handles calcium, magnesium, and vitamin D, and steroid hormone metabolism. Milligrams matter, megadoses do not help. I take it as a supporting actor, not a main character.

Chromium. Glucose metabolism. I watched my own fasting glucose drop from 126 to 99 in 22 days on a targeted stack, and chromium was in that stack. I cannot isolate its individual contribution, n of 1 does not work that way, but it earned its place in my pack.

Trace minerals. The long tail: manganese, molybdenum, selenium, copper and the rest. Individually unglamorous. Collectively they are the parts bin your enzymes pull from, and the foods that used to supply them are the same foods in Davis's dataset.

The D complex, with A, D, E, and K. You will notice these are vitamins, not minerals. Good job. They ride in the same pouch because fat soluble vitamins and minerals are collaborators, not passengers. Vitamin D controls how much calcium you absorb. Vitamin K2 decides where that calcium goes, bone rather than arterial wall. Taking calcium without D and K is like hiring movers and forgetting to tell them the new address.

The other side of the coin

The strongest objection I hear to this argument is that intake surveys measure what people eat, not what a specific person needs, and crop decline data cannot tell you that you are deficient. I concede both points fully. A population level shortfall is a probability statement, not a diagnosis, and the rigorous answer to a probability statement is measurement: test, then supplement, then retest. I just told you I mostly did not do that. Here's why:

Test what, exactly? Serum magnesium sounds authoritative until you remember that less than one percent of the body's magnesium is in serum. The rest is in bone and inside cells, and the body defends the serum number ruthlessly, pulling from those reserves to keep it flat. A normal serum magnesium is compatible with depleted tissue stores, which is precisely why it stays normal right up until it doesn't. Serum calcium is worse: it is so tightly regulated by parathyroid hormone that it tells you almost nothing about the skeleton it is borrowing from. That is what the DEXA is for, and DEXA measures the consequence, years downstream, not the balance today. Red blood cell magnesium gets closer to the intracellular story but the reference ranges are soft and the correlation with total body status is debated. Zinc has no great marker at all; serum zinc drifts with inflammation, meals, and time of day. So "test, then supplement" is easier to say than to do. For several of these minerals, the honest options are a proxy measurement of contested meaning or an intake estimate. I know which compartment I care about, the one doing the enzymatic work inside the cell, and there is no routine lab that reads it directly.

Here is why my bet is still rational without the labs. Minerals are not like most supplements, where the question is whether an exotic molecule does anything at all. There is no debate about whether humans need magnesium. The only open question is whether your inputs cover your requirements, and the two best datasets we have, what is in the food and what people actually eat, both point the same bad direction. When half the population is short on a mineral, and the fix costs pennies at doses far below any toxicity threshold, you do not need a personal test result to justify acting. The odds alone justify it.

Everything else in my routine is a bet on an upside. The mineral pack is insurance against a documented shortfall.

That is why it is the one I never skip.

These statements have not been evaluated by the Food and Drug Administration. This content is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease.