By Erica Oberg, ND, MPH
One of the most common things I see in practice is a patient who is doing everything right.
They’re eating well. Exercising regularly. Taking supplements. Prioritizing sleep. Yet they still struggle with fatigue, brain fog, muscle cramps, low mood, or poor recovery.
Sometimes the answer isn’t a new diagnosis.
Sometimes it’s a nutrient deficiency caused by a medication they’ve been taking for years.
Most medications are designed to influence a specific pathway in the body. What many people don’t realize is that they can also affect how nutrients are absorbed, utilized, or excreted. Over time, these seemingly small effects can add up and influence energy, cognition, cardiovascular health, immune function, and healthy aging.
This doesn’t mean you should stop taking prescribed medications. It simply means that understanding these interactions can help you support your body more effectively.
Five Medication-Nutrient Interactions I Watch for Most Often
1. Acid-Blocking Medications Can Deplete Vitamin B12 and Magnesium
Proton pump inhibitors (PPIs) such as omeprazole (Prilosec), esomeprazole (Nexium), and pantoprazole (Protonix) are among the most commonly prescribed medications in the United States.
While they can be very effective for managing reflux symptoms, they also reduce stomach acid—a key component required for absorbing several nutrients.
Long-term use has been associated with reduced absorption of:
- Vitamin B12
- Magnesium
- Calcium
Low B12 can contribute to fatigue, memory concerns, numbness or tingling, and mood changes. Magnesium deficiency may show up as muscle cramps, headaches, sleep disturbances, or heart rhythm irregularities.
2. Metformin Can Lower Vitamin B12
Metformin is a valuable medication for blood sugar regulation and is increasingly used in longevity-focused medicine. However, long-term use can reduce Vitamin B12 absorption.
Because B12 plays a critical role in nerve health, energy production, and brain function, I routinely monitor levels in patients taking metformin for extended periods.
3. Statins Can Reduce CoQ10
Statin medications lower cholesterol by blocking the same metabolic pathway used to produce Coenzyme Q10 (CoQ10).
CoQ10 is essential for mitochondrial energy production. In simple terms, it helps your cells create energy.
When levels decline, some patients notice:
- Fatigue
- Reduced exercise tolerance
- Muscle aches
- Slower recovery
While not everyone taking a statin will develop symptoms, this is one of the most well-known medication-related nutrient depletions.
4. Birth Control Pills Affect Multiple Nutrients
Oral contraceptives have been associated with lower levels of several nutrients, including:
- Vitamin B6
- Folate
- Vitamin B12
- Vitamin C
- Riboflavin
- Pantothenic acid (Vitamin B5)
This becomes particularly important for women who are planning pregnancy, have methylation-related genetic variants, or experience symptoms such as fatigue and mood changes.
5. Diuretics Can Deplete Minerals
Common blood pressure medications and water pills can increase the urinary loss of important minerals.
Nutrients most commonly affected include:
- Magnesium
- Zinc
- Thiamine (Vitamin B1)
Over time, deficiencies may contribute to fatigue, muscle cramps, impaired recovery, and cardiovascular concerns.
Symptoms That May Suggest a Nutrient Deficiency
Many symptoms of nutrient depletion are subtle and develop gradually.
Common signs include:
- Fatigue
- Brain fog
- Poor concentration
- Numbness or tingling
- Muscle cramps
- Frequent headaches
- Low mood
- Sleep disturbances
- Reduced exercise recovery
Of course, these symptoms can have many causes. Nutrient depletion is simply one possibility that is often overlooked.
Testing Beats Guessing
One of the principles I emphasize in my practice is that we should avoid guessing whenever possible.
While many people benefit from targeted supplementation, taking large numbers of supplements without understanding your individual needs can be expensive and sometimes counterproductive.
Instead, I prefer a personalized approach.
For patients taking long-term medications, I often review medication history, assess dietary patterns, evaluate symptoms, and consider laboratory testing to identify potential nutrient insufficiencies before recommending a targeted plan.
The Bottom Line
Medications save lives and improve quality of life for millions of people. This article is not about fear or avoiding treatment.
It is about understanding the bigger picture.
When we identify and address medication-related nutrient depletion, we can often improve energy, resilience, cognitive performance, and overall well-being while continuing to benefit from the medications that are medically necessary.
If you’re taking one or more long-term medications and are curious about how they may be affecting your nutritional status, it may be worth having the conversation.
Your prescription may be helping one part of your health while quietly creating needs elsewhere—and those needs are often both measurable and correctable.
