Component
Erection hardness score
Erection hardness score. Species, exposure and limitations are retained in each linked claim.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What acts on it
Normal-range erection hardness was reported in 12/24 men during citrulline versus 2/24 during the preceding placebo month.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/citrulline-research/21195829.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b85dfbc0993e9d8f01bdc021151650d6466c9204a7d7158e488ce66416e1df74", "start_char": 0, "end_char": 1897, "text_sha256": "b85dfbc0993e9d8f01bdc021151650d6466c9204a7d7158e488ce66416e1df74"}
- experimental_model
- Single-blind fixed-sequence placebo then active pilot
- exposure
- One month placebo followed by one month L-citrulline 1.5 g/day
- limitations
- Not a randomized-order crossover; expectation, time and sequence effects cannot be excluded; no direct PDE5-inhibitor comparison.
- nutrient_topic
- Citrulline research collection; topical membership is not evidence of a direct dietary effect. · L-Citrulline
- organism
- Human, 24 men with mild erectile dysfunction
- plain_language
- An encouraging pilot finding needs stronger trial confirmation.
- primary_references
- [citrulline-p21195829] Oral L-citrulline supplementation improves erection hardness in men with mild erectile dysfunction. (2011). https://pubmed.ncbi.nlm.nih.gov/21195829/ DOI: 10.1016/j.urology.2010.08.028
- tissue_or_cell_type
- Erection hardness
Citrulline: arginine recycling, nitrogen disposal and nutrient connections (2026-09-17) · lines 1243–1254
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Single-blind fixed-sequence placebo then active pilot · source_derived_draft · unverified_draft
### citrulline-erection-pilot Normal-range erection hardness was reported in 12/24 men during citrulline versus 2/24 during the preceding placebo month. Condition category: normal nutrient_topic: Citrulline research collection; topical membership is not evidence of a direct dietary effect. plain_language: An encouraging pilot finding needs stronger trial confirmation. organism: Human, 24 men with mild erectile dysfunction tissue_or_cell_type: Erection hardness experimental_model: Single-blind fixed-sequence placebo then active pilot limitations: Not a randomized-order crossover; expectation, time and sequence effects cannot be excluded; no direct PDE5-inhibitor comparison. exposure: One month placebo followed by one month L-citrulline 1.5 g/day evidence_span: {"source_cache": "artifacts/citrulline-research/21195829.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b85dfbc0993e9d8f01bdc021151650d6466c9204a7d7158e488ce66416e1df74", "start_char": 0, "end_char": 1897, "text_sha256": "b85dfbc0993e9d8f01bdc021151650d6466c9204a7d7158e488ce66416e1df74"} [citrulline-p21195829] Oral L-citrulline supplementation improves erection hardness in men with mild erectile dysfunction. (2011). https://pubmed.ncbi.nlm.nih.gov/21195829/ DOI: 10.1016/j.urology.2010.08.028
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.