OYAH INGREDIENT LIBRARY

L-citrulline

L-citrulline can raise circulating arginine and support nitric-oxide production. Exercise findings differ across endurance, strength and recovery outcomes.

Evidence reviewUpdated 11 October 2026
LNitric oxide pathway / amino acid
Evidence signalMixed; small effects in selected exercise outcomes
Research focusBlood flow, endurance, repetitions and soreness
Key qualifierPure citrulline versus citrulline malate

What it is

L-citrulline is an amino acid converted partly to arginine, which supports nitric-oxide synthesis. Citrulline malate combines citrulline with malate; products and studies may report the compound weight rather than pure citrulline.

What human research suggests

Meta-analyses report mixed endurance results and small improvements in some high-intensity repetition outcomes. Effects on soreness and perceived exertion vary. Evidence does not support a guaranteed pump, stamina or recovery response.

HOW THIS RELATES TO OYAH

L-citrulline in an OYAH formula.

The related product page shows the current ingredient list and directions. Compare those details with each paper before deciding how closely the evidence applies. OYAH does not claim that the finished formula was tested in the linked studies.

L-Citrulline & L-Arginine StackView L-Citrulline & L-Arginine Stack
Ingredient studyTests a defined ingredient, preparation and protocol.Finished-product evidenceWould require a clinical trial of the complete formula.Certificate of AnalysisReports the tests shown for a sample or lot; it does not establish benefit.
SAFETY & CONTEXT

What to consider before use.

Citrulline may lower blood pressure. Use caution with nitrates, blood-pressure medicines or erectile-dysfunction medicines. Gastrointestinal symptoms can occur. Clinical guidance matters for cardiovascular, kidney or pregnancy-related concerns.

This guide is educational and is not medical advice. Speak with a qualified healthcare professional about pregnancy, breastfeeding, medical conditions, medicines, surgery or persistent symptoms.

READ THE SOURCES

Follow the evidence.

Each link opens the publication, indexed record or government guidance. Study findings remain limited to the preparation and protocol researchers examined.

  1. Citrulline malate and exercise2026 systematic review and meta-analysis · PMID 42356270 ↗
  2. Citrulline and endurance performance2023 systematic review and meta-analysis · PMID 37155582 ↗
  3. Citrulline malate and strength repetitions2021 systematic review and meta-analysis · PMID 34010809 ↗
  4. Citrulline and exercise recovery measures2020 systematic review and meta-analysis · PMID 33308806 ↗
Current product directory

Know the product. Read the evidence.

Compare the current OYAH range, then open the product-specific evidence and ingredient guides. Ingredient studies do not establish the benefits of a finished OYAH formula.