The 7 Nutrients Your Protocol Is Depleting

The Hidden Cost

Every medication has a primary effect — the one you're paying for — and secondary effects, the ones nobody mentions at the pharmacy counter. Among the most common and least discussed of these secondary effects are drug-nutrient interactions: the slow, silent depletion of vitamins and minerals your body needs to function.

Your protocol is working. The testosterone is building tissue. The semaglutide is reducing appetite. The statin is lowering LDL. But each of these compounds is quietly drawing down a nutrient reserve your body depends on — often for the very goals that brought you to the protocol in the first place.

This is not a reason to stop your medication. It is a reason to track what it takes.

1. TRT → Zinc

Testosterone replacement therapy may increase zinc demand. Zinc is a cofactor in testosterone synthesis, immune function, and — critically — protein synthesis. Exogenous testosterone does not reduce the body's zinc demand, and the increased activity of zinc-dependent pathways may increase it.

Griggs et al. (1989) demonstrated that testosterone directly increases muscle protein synthesis rates.^[1] Bachman et al. (2014) further showed that TRT stimulates erythropoiesis — red blood cell production.^[2] While no RCT has directly measured zinc depletion from TRT, zinc serves as a cofactor in multiple testosterone-stimulated pathways — including protein synthesis and erythropoiesis — suggesting increased utilization.

Signs of zinc deficiency are deceptively mundane: slow wound healing, reduced immune function, altered taste, and impaired recovery between training sessions. Most people attribute these to overtraining or poor sleep before they consider a mineral deficit.

2. Semaglutide → B12

GLP-1 receptor agonists reduce food intake and slow gastric motility — both mechanisms that impair B12 absorption. You eat less, the food moves slower, and the intrinsic factor pathway that absorbs B12 in the terminal ileum operates under conditions it was not designed for.

Urbina et al. (2026) reported up to a 22% reduction in B12 levels in GLP-1 users, with deficiency risk increasing with treatment duration.^[3] The primary mechanism is likely reduced food intake rather than direct intrinsic factor interference, though slowed gastric motility may also contribute. B12 deficiency causes fatigue, peripheral neuropathy, cognitive fog, and mood disturbances that can mimic depression — symptoms easy to misattribute when you are already in a caloric deficit.

3. Metformin → Folate

Metformin is the most-prescribed diabetes medication worldwide and is increasingly used off-label for longevity and insulin sensitization. It reduces folate absorption through the intestinal wall by interfering with calcium-dependent membrane transport.

Low folate elevates homocysteine — an independent cardiovascular risk marker. The irony is sharp: a medication often taken to improve metabolic health can quietly increase cardiovascular risk through a nutrient pathway no one is monitoring.

4. PPIs → Magnesium

Proton pump inhibitors — omeprazole, pantoprazole, esomeprazole — reduce stomach acid. Stomach acid is required for magnesium absorption. The math is straightforward: suppress the acid, suppress the absorption.

Long-term PPI use (greater than one year) can cause clinically significant magnesium depletion. The symptoms overlap with half a dozen other conditions: muscle cramps, fatigue, heart palpitations, and insomnia. Magnesium is involved in over 300 enzymatic reactions. When it drops, you feel it everywhere and attribute it to nothing specific.

5. Statins → CoQ10

Statins block HMG-CoA reductase, the enzyme that produces cholesterol. That is their job. But the same biosynthetic pathway also produces Coenzyme Q10 — a molecule critical for mitochondrial energy production. Block the pathway, block both outputs.

CoQ10 depletion may explain the muscle pain and fatigue that affects up to 30% of statin users — a side effect often severe enough to cause discontinuation. The muscle cells that need CoQ10 the most are the ones you are training the hardest.

6. Corticosteroids → Calcium & Vitamin D

Corticosteroids — prednisone, dexamethasone, methylprednisolone — reduce calcium absorption from the gut and accelerate calcium excretion through the kidneys. The net effect is accelerated bone loss. Even short courses increase fracture risk. Chronic use is one of the leading causes of secondary osteoporosis.

Corticosteroids also suppress the activation of vitamin D, compounding the calcium problem. Without adequate vitamin D, the body cannot absorb calcium efficiently regardless of intake. The two depletions reinforce each other.

7. SSRIs → Sodium

SSRIs — fluoxetine, sertraline, paroxetine, escitalopram — can cause SIADH (syndrome of inappropriate antidiuretic hormone secretion), leading to hyponatremia: dangerously low sodium. The body retains water, diluting serum sodium below functional thresholds.

This is more common in older adults but occurs across age groups, particularly in the first few months of treatment. Symptoms include confusion, fatigue, headaches, nausea, and in severe cases, falls and seizures. The instinct to restrict salt — common in health-conscious populations — can make this worse.

How to Track

The pattern across all seven depletions is the same: know what your medication takes, supplement accordingly, and monitor with bloodwork. Most of these depletions are silent. They build over months before symptoms appear. By the time you feel it — the fatigue, the cramps, the brain fog — you are already deep in deficit.

Lab monitoring at three-to-six-month intervals catches these early, before they become clinical problems. The cost of a zinc or B12 test is trivial compared to the cost of months of unexplained symptoms.

The ideal system would cross-reference your medication list against known nutrient depletions automatically — flagging interactions before they become deficiencies. Some pharmacy tools and emerging health apps offer versions of this — the key is finding one that covers your specific medications. Most doctors do not have time to track these interactions across all patients. Which means the responsibility often falls on you.

• •Know your depletions. Every medication in this article has well-documented nutrient interactions. Ask your pharmacist or look them up. Don't assume someone else is tracking this for you.
• •Track your labs. Request the relevant tests at your next bloodwork appointment. Zinc, B12, folate, magnesium, vitamin D, and CoQ10 are all inexpensive to measure.
• •Close the loop. Supplement the gaps, retest in 3–6 months, and adjust. This is not guesswork — it is protocol management.

References

1. [1] Griggs RC, Kingston W, Jozefowicz RF, et al. “Effect of testosterone on muscle mass and muscle protein synthesis.” J Appl Physiol. 1989;66(1):498–503.
2. [2] Bachman E, Feng R, Travison T, et al. “Testosterone induces erythrocytosis via increased erythropoietin and suppressed hepcidin.” J Gerontol A Biol Sci Med Sci. 2014;69(6):725–735.
3. [3] Urbina J, Soliman M, Engel E, et al. “Micronutrient and Nutritional Deficiencies Associated With GLP-1 Receptor Agonist Therapy.” Clin Obes. 2026;16(1):e70070.