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Evidence-Based Supplement Research
Evidence-Based Supplement Research

L-ornithine supplementation in periodontitis treatment yields greater benefits than L-arginine after one year: Part II of a randomized controlled pilot study.

  • 2025-09
  • Complementary therapies in medicine 92
    • Viktoriya I Shynkevych
    • Svitlana V Kolomiiets
    • Kristina O Udaltsova
    • Igor P Kaidashev

Study Design

Type
Randomized Controlled Trial (RCT)
Sample size
n = 75
Population
75 patients who previously received the course of L-arginine or L-ornithine as adjuncts to professional mechanical plaque removal (PMPR) during a preliminary randomized short-term part of a clinical trial
Methods
assessed clinically and immunologically (nested) after 12 months follow-up. All patients did not receive new prescriptions or dietary changes and underwent personalized steps of periodontal treatment during observation
Duration
12 months follow-up
Funding
Unclear

Background

L-arginine and L-ornithine have previously shown limited short-term immunological benefits in the treatment of periodontitis. The aim of this study was to assess the extended efficacy and durability of the response to L-arginine or L-ornithine as adjuncts to periodontal therapy in adults with periodontitis.

Materials and methods

In this study, 75 patients who previously received the course of L-arginine or L-ornithine as adjuncts to professional mechanical plaque removal (PMPR) during a preliminary randomized short-term part of a clinical trial (NCT05042024) were assessed clinically and immunologically (nested) after 12 months follow-up. The immunological assay included immunohistochemical identification of densities of CD68 + and CD163 + single-positive gingival macrophages. All patients did not receive new prescriptions or dietary changes and underwent personalized steps of periodontal treatment during observation.

Results

After one year, patients who received L-arginine or L-ornithine exhibited a significant reduction of sites with periodontal pocket depth of 4-5 mm compared to PMPR (p < 0.0001). L-ornithine was associated with BoP decreasing compared to PMPR and L-arginine (95 % CI of odds ratio [1.12-1.46], p = 0.0002; CI [0.72-0.94], p = 0.004), CD68 + and CD163 + macrophages density increasing compared to PMPR (p < 0.001) and L-arginine (p < 0.05). L-arginine resulted in increased density of CD68 + macrophages and elevated CD68 + /CD163 + ratio compared to the PMPR and L-ornithine; CI [0.41-0.63], p = 0.009, CI [1.45-2.72], p < 0.0001.

Conclusion

After one year, L-ornithine supplementation demonstrated more pronounced clinical benefits than L-arginine, although both can modulate gingival CD68 + and CD163 + macrophages.

Research Insights

  • L-arginine resulted in increased density of CD68+ macrophages and elevated CD68+/CD163+ ratio compared to the PMPR and L-ornithine; CI [0.41-0.63], p = 0.009, CI [1.45-2.72], p < 0.0001

    Effect
    Harmful
    Effect size
    Large
  • L-arginine resulted in increased density of CD68+ macrophages and elevated CD68+/CD163+ ratio compared to the PMPR and L-ornithine; CI [0.41-0.63], p = 0.009, CI [1.45-2.72], p < 0.0001

    Effect
    Beneficial
    Effect size
    Moderate
  • L-ornithine was associated with BoP decreasing compared to PMPR and L-arginine ... CI [0.72-0.94], p = 0.004

    Effect
    Neutral
    Effect size
    Small
  • After one year, patients who received L-arginine or L-ornithine exhibited a significant reduction of sites with periodontal pocket depth of 4-5 mm compared to PMPR (p < 0.0001)

    Effect
    Beneficial
    Effect size
    Large
  • CD68+ and CD163+ macrophages density increasing compared to PMPR (p < 0.001) and L-arginine (p < 0.05)

    Effect
    Beneficial
    Effect size
    Moderate
  • L-arginine resulted in increased density of CD68+ macrophages and elevated CD68+/CD163+ ratio compared to the PMPR and L-ornithine; CI [0.41-0.63], p = 0.009, CI [1.45-2.72], p < 0.0001

    Effect
    Beneficial
    Effect size
    Moderate
  • L-ornithine was associated with BoP decreasing compared to PMPR and L-arginine ... CI [0.72-0.94], p = 0.004

    Effect
    Neutral
    Effect size
    Small
  • After one year, patients who received L-arginine or L-ornithine exhibited a significant reduction of sites with periodontal pocket depth of 4-5 mm compared to PMPR (p < 0.0001)

    Effect
    Beneficial
    Effect size
    Large
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