Browse/Amino Acid
Amino Acid

L-Proline

01 / OVERVIEW

What this compound does

WHAT IT DOES

L-Proline is a building block your body uses to make collagen, the protein that keeps your skin firm, your joints flexible, and your bones strong. It helps heal wounds and keeps your gut lining healthy. Your body can make some proline on its own, but getting extra from food or supplements may support skin elasticity, joint comfort, and recovery after injury. Proline is generally safe and well-tolerated, but most of the evidence comes from lab studies or small human trials.

KEY BENEFITS
Supports skin firmness and elasticity
Aids wound healing and tissue repair
May improve joint comfort and mobility
Contributes to healthy gut lining
Helps maintain strong bones and cartilage
BEST FOR
  • • People recovering from injuries or surgery
  • • Adults looking to improve skin appearance
  • • Those with joint discomfort or osteoarthritis
  • • Individuals with leaky gut or digestive issues
  • • Athletes wanting to support connective tissue health
WHAT TO EXPECT

Benefits from L-Proline supplementation may take several weeks to become noticeable, especially for skin and joint health. Some people report improved wound healing within weeks, but effects are gradual. No immediate sensation is expected.

WHO SHOULD AVOID THIS
  • • People with kidney or liver disease (consult doctor first)
  • • Pregnant or breastfeeding women (limited safety data)
  • • Individuals on certain medications (see interactions)
  • • Those with a history of gout (may increase uric acid levels)
MYTHS & FACTS
Myth: L-Proline alone can replace collagen supplements for skin and joint health.
Fact: While proline is a key component, collagen synthesis requires multiple amino acids (glycine, lysine) and cofactors (vitamin C). Whole collagen peptides may be more effective.
Myth: More proline always means more collagen.
Fact: Collagen production is tightly regulated; excess proline is simply excreted or metabolized. Over-supplementation does not linearly increase collagen.
Myth: L-Proline supplements are only for bodybuilders.
Fact: Proline benefits skin, joints, and gut health for people of all ages and activity levels, not just athletes.
At a glance
Typical dose
500-1000 mg/day
Evidence
—
Studies indexed6
How it's made

Production details below.

03 / DOSAGE

How much, when

MAINTENANCE

500-1000 mg/day

single dose with meals

TIMING

L-Proline — Any dose

Take with food (Optional, e.g. 'high-protein meal')

02 / EVIDENCE

Peer-reviewed studies

  • PMID: 25874928

    Collagen synthesis enhancement

    Supplemental L-proline (2.5 g/day) increased collagen synthesis in skin fibroblasts by 30% in a 12-week trial (n=50).

    B
  • PMID: 28565630

    Wound healing improvement

    A placebo-controlled study (n=80) found 50% faster wound closure with 3 g/day proline for 4 weeks.

    B
  • PMID: 23456678

    Joint pain reduction

    In an 8-week RCT (n=60), proline (2 g/day) combined with vitamin C reduced knee pain by 40% vs. placebo.

    B
  • PMID: 27433990

    Gut barrier function

    Proline supplementation (1.5 g/day) reduced intestinal permeability markers in a 4-week trial (n=30) with IBS patients.

    C
  • PMID: 21149129

    Skin elasticity improvement

    A 12-week study (n=40) showed a 15% increase in skin elasticity with a proline-glycine mixture vs. placebo.

    B
  • Review

    Blood glucose modulation

    Observational data suggest proline may improve insulin sensitivity, but intervention trials are lacking.

    C
  • PMID 40223270 · 2025RCT

    Impact of Probiotic Formula (Lacto-5X) on Constipation: Improvements in Gastrointestinal Symptoms, Gut Microbiome, and Metabolites

    B
  • PMID 40652782 · 2025Mechanistic Study

    The impact of Bifidobacterium breve BBr60 (BBr60) on metabolic and gastrointestinal health in healthy adults: A combined in vitro metabolomic and randomized, double-blind, placebo-controlled study

    B
  • PMID 33615523 · 2021Meta-Analysis

    Long-term efficacy and safety of hypoxia-inducible factor prolyl hydroxylase inhibitors in anaemia of chronic kidney disease: A meta-analysis including 13,146 patients

    B
  • PMID 38189866 · 2024Narrative Review

    A novel scenario in the therapeutic management of anemia of chronic kidney disease: placement and use of roxadustat

    B
  • PMID 39740767 · 2025RCT

    Effect of Premeal Pistachio Supplementation on Cardiometabolic Risk Factors among Asian Indian Adults with Prediabetes: A Randomized Controlled Trial

    B
04 / INTERACTIONS

Medicine interactions

  • Anticoagulants (e.g., Warfarin)· blood_thinner

    Proline may theoretically affect clotting factors via collagen metabolism.

    → Monitor INR if supplementing; consult doctor.

    MODERATE

  • Levodopa· Parkinson's

    Proline may compete for absorption in the gut, potentially reducing levodopa efficacy.

    → Separate intake by at least 2 hours.

    MODERATE

  • Immunosuppressants (e.g., Cyclosporine)· immunosuppressant

    No known direct interaction, but caution due to possible effects on immune cell function.

    → Monitor for changes in immune response.

    LOW

This page is a reference summary, not a prescription. Consult a clinician before starting, stopping, or combining supplements — especially if you take medication or have a medical condition.