PPIs & Nutrient Deficiencies: Risks of Long-Term Use (Omeprazole, Prilosec & More)

The familiar relief offered by common acid reflux medications, including Prilosec, Nexium, and Protonix, may come with subtle long-term risks. Recent research from Brazil suggests a link between prolonged use of proton pump inhibitors (PPIs) and disruptions in the body’s ability to absorb essential nutrients like iron and calcium, potentially increasing the risk of anemia and osteoporosis. While these medications remain effective for managing conditions like ulcers, gastritis, and acid reflux, experts emphasize the importance of using them only as directed by a physician.

How PPIs Impact Nutrient Absorption

Proton pump inhibitors work by reducing stomach acid production, offering relief from painful symptoms. Yet, stomach acid isn’t solely responsible for discomfort; it also plays a crucial role in the absorption of key minerals. The study, conducted by scientists at the Federal University of São Paulo (UNIFESP) and the ABC Medical School (FMABC), examined the effects of long-term omeprazole use on mineral absorption in rats. Researchers found that continuous use of omeprazole altered the distribution of minerals throughout the body, leading to accumulation in the stomach and imbalances in the spleen and liver. Specifically, blood tests revealed increased calcium levels and decreased iron levels – changes that raise concerns about bone health and the potential for anemia. ScienceDaily reported on these findings February 26, 2026.

The research, published in ACS Omega, involved dividing adult rats into control and treatment groups, with the treatment group receiving omeprazole for 10, 30, and 60 days to simulate varying durations of human use. The findings suggest that prolonged suppression of stomach acid can interfere with the body’s natural processes for obtaining vital nutrients. It’s important to note that this study was conducted on rats, and further research is needed to confirm these effects in humans.

Beyond Omeprazole: Implications for Other PPIs

While the study focused specifically on omeprazole, researchers believe the implications extend to other drugs within the PPI class, such as pantoprazole (Protonix) and esomeprazole (Nexium). According to Andréa Santana de Brito, a researcher at UNIFESP, these newer PPIs may even have a more pronounced effect due to their more potent and longer-lasting action. EurekAlert! highlighted this concern in a February 9, 2026 news release. Some PPIs accept longer to allow the regeneration of proton pumps, potentially intensifying side effects.

A Growing Concern: Overuse and Over-the-Counter Access

Omeprazole has been widely available for over three decades, and its use has become increasingly common, often extending for months or even years without consistent medical oversight. This trend is further complicated by a recent decision by the Brazilian Health Regulatory Agency (ANVISA) to authorize over-the-counter sales of 20mg omeprazole in November 2025. Researchers worry that easier access could encourage self-medication and prolonged use, potentially exceeding the recommended 14-day treatment period.

ANVISA, however, maintains that the move aims to promote responsible use, emphasizing the importance of limiting treatment duration and encouraging patients to seek medical evaluation for persistent symptoms. The agency states that clear guidelines on package inserts and labels will help consumers make informed decisions, and that packages exceeding a 14-day supply will still require a prescription.

Understanding the Mechanism: The Proton Pump and Nutrient Absorption

PPIs exert their effect by blocking the H+, K+, ATPase enzyme, also known as the proton pump. This enzyme is essential for producing hydrochloric acid in the stomach. By suppressing acid production, these drugs effectively alleviate symptoms of ulcers, gastritis, and acid reflux. However, as the Brazilian study demonstrates, this suppression also impacts the body’s ability to absorb certain nutrients that rely on an acidic environment for proper uptake. The study expanded on previously recognized links between PPIs and reduced nutrient absorption by examining a wider range of minerals, including magnesium and zinc.

What Does This Mean for Patients?

The findings don’t suggest that PPIs are inherently dangerous. They are effective medications for managing a range of gastrointestinal conditions. However, the research underscores the importance of a cautious approach to their use. Prolonged, unsupervised use should be avoided. Individuals currently taking PPIs long-term should discuss their treatment plan with their healthcare provider to assess potential risks and benefits, and to explore whether alternative strategies or nutrient supplementation might be appropriate. It’s crucial to remember that this study was conducted on rats, and more research is needed to fully understand the effects of long-term PPI use in humans.

The Role of Medical Supervision and Future Research

Angerson Nogueira do Nascimento, the UNIFESP professor who coordinated the study, emphasized the need for longer-term studies to confirm the potential link between increased calcium levels and osteoporosis risk. He also highlighted the importance of individualized medical supervision to evaluate the need for supplementation in cases where nutrient deficiencies are suspected. The research team recommends a rational approach to PPI use, balancing the benefits of symptom relief with the potential for long-term nutritional consequences.

Further investigation is needed to determine the optimal duration of PPI treatment, identify individuals at higher risk of nutrient deficiencies, and develop strategies to mitigate these risks. This includes exploring the potential benefits of dietary modifications and targeted nutrient supplementation under the guidance of a qualified healthcare professional. ACS Omega provides further details on the study methodology and findings.

What comes next: Researchers are planning follow-up studies to investigate the long-term effects of PPIs on bone density and immune function in both animal models and human populations. These studies will aim to clarify the mechanisms underlying the observed nutrient imbalances and to identify potential interventions to minimize the risks associated with prolonged PPI use. Ongoing surveillance of PPI use and associated health outcomes will also be crucial for informing clinical practice and public health recommendations.