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Factors Influencing Bioavailability: First-Pass Elimination01:23

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When a drug is taken orally, it undergoes a journey starting from the gastrointestinal (GI) tract, passing through the portal vein, reaching the liver, and finally entering the systemic circulation. This process involves the absorption of the drug across the GI tract. The liver is the primary site for metabolizing the drug, with some metabolism also occurring in the gut wall. This journey significantly reduces the quantity of the drug that reaches the systemic circulation, a phenomenon known as...
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Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
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Factors Influencing Drug Absorption: Anatomical Parameters01:23

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Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
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Factors Influencing Drug Absorption: Physicochemical Parameters01:22

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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
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Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
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Factors Influencing Drug Absorption: Pharmaceutical Parameters01:28

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Solid dosage forms such as tablets and capsules undergo rigorous manufacturing processes to ensure stability and effectiveness. Their dissolution and absorption properties are influenced significantly by the choice of excipients (inactive ingredients that serve various roles in the formulation), and the methodology applied during production. The manufacturing parameters, such as compression force and granulation techniques, significantly affect dissolution rates. Elevated compression forces...
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Nutritional Factors Affecting Magnesium Bioavailability: A Narrative Review.

Lusliany J Rondón1,2

  • 1Center for Biophysics and Biochemistry (CBB), Venezuelan Institute of Scientific Research (IVIC), Altos de Pipe, Venezuela. luslianyrondonv@hotmail.com.

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|July 16, 2025
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Summary
This summary is machine-generated.

Magnesium is vital for health, but Western diets often lead to low intake. This review explores dietary factors influencing magnesium absorption and offers recommendations for better nutritional status.

Keywords:
Factors influencing magnesiumMagnesiumMagnesium bioavailabilityMagnesium intake

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Area of Science:

  • Nutrition Science
  • Human Physiology

Background:

  • Magnesium is the second most abundant intracellular ion, crucial for physiological functions.
  • Maintaining magnesium homeostasis involves a balance of intake, excretion, and body stores.
  • Current Western dietary patterns frequently result in inadequate magnesium intake and compromised status.

Purpose of the Study:

  • To review nutritional factors that influence magnesium bioavailability.
  • To inform dietary planning and the establishment of Dietary Reference Intakes (DRIs).
  • To prevent magnesium deficiency and associated non-communicable diseases.

Main Methods:

  • Narrative review of scientific literature.
  • Evaluation of nutritional and physicochemical factors affecting magnesium absorption.
  • Analysis of dietary enhancers and inhibitors of magnesium uptake.

Main Results:

  • Dietary factors significantly impact magnesium absorption in the intestine.
  • Specific nutrients and food types can either enhance or inhibit magnesium bioavailability.
  • Alkalinizing foods like fruits and vegetables are beneficial for magnesium status.

Conclusions:

  • Dietary modifications can improve magnesium bioavailability and status.
  • Reducing sodium intake and increasing consumption of fruits and vegetables are recommended.
  • Optimizing dietary magnesium intake is essential for preventing deficiency and non-communicable diseases.