Andarine (S4)
S-40503 / GTx-007
Also known as: Andarine, S4, GTx-007, S-40503
This ingredient is classified as unclassified risk (GIRI score: 8.5/10).
Safety Profile
Known Safety Concerns
- Unapproved drug — illegal as dietary supplement
- Causes visual disturbances: yellow tint, night vision impairment
- Drug-induced liver injury documented
- Suppresses natural testosterone production
- WADA-prohibited — athlete sanctions from supplement contamination
Contraindications
- Unapproved drug — illegal as dietary supplement
- Causes visual disturbances: yellow tint, night vision impairment
Interactions
Information not yet available for this ingredient profile.
Evidence and Scientific Findings
Ingredient Overview
Andarine is an unapproved SARM with no approved human use that is sold as a supplement. It was abandoned in clinical trials due to vision side effects — users reported a yellow/green tint to vision and difficulty adjusting to light. Like all SARMs, it causes hepatotoxicity and hormone suppression. The FDA classifies it as an illegal drug when sold as a supplement. WADA prohibits it and athletes have been sanctioned from contaminated supplements.
Biological and Chemical Classification
- Scientific Name
- S-40503 / GTx-007
Mechanism of Action
Information not yet available for this ingredient profile.
Clinical Evidence of Effectiveness
Information not yet available for this ingredient profile.
Pharmacokinetics
Information not yet available for this ingredient profile.
Recommended Dosage
Information not yet available for this ingredient profile.
SETI — Scientific Evidence Transparency Index
Executive Summary — Ingredient Assessment
- 1 study reviewed
- 0 high-quality studies (meta-analysis or RCT)
- Main clinical benefit observed: Banned Substance
- Evidence consistency: High consistency across studies (100%)
- Unapproved drug — illegal as dietary supplement
- Causes visual disturbances: yellow tint, night vision impairment
- Drug-induced liver injury documented
- Suppresses natural testosterone production
- WADA-prohibited — athlete sanctions from supplement contamination
The available scientific evidence for Andarine (S4) indicates notable safety signals that warrant caution. Use should be considered carefully and monitored, particularly in sensitive populations or alongside other medications.
Total SETI Score
High risk| Evidence quality | 1/40 |
| Evidence consistency | 20/20 |
| Safety signals | 18/20 |
| Study recency | 10/10 |
| Evidence transparency | 10/10 |
Evidence Summary
- 1 study reviewed
- 0 high-quality studies (meta-analysis or systematic review)
- 0 studies identified benefits or no safety concern (GREEN)
- 1 study reported limited or advisory safety evidence (YELLOW)
Evidence Policy
Only peer-reviewed scientific literature indexed in PubMed or comparable databases is included in this evaluation. Commercial websites, blogs, and marketing materials are excluded. All references include direct traceable links to source documents.
Last updated: 23 მარ 2026, 15:16
Evidence Distribution
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Observational / other LOW evidence YELLOWExploring the potentials of S4, a selective androgen receptor modulator, in glioblastoma multiforme therapy. ↗Yavuz M et al.. Exploring the potentials of S4, a selective androgen receptor modulator, in glioblastoma multiforme therapy.. Toxicol Appl Pharmacol. 2024. PMID:38997069.PMID 38997069 ↗Journal Toxicol Appl PharmacolYear 2024Study type Observational / otherEvidence strength LOW evidencePubMed link https://pubmed.ncbi.nlm.nih.gov/38997069/
Score Transparency
0 of 10 approved references (score saturates at 10). More peer-reviewed studies = stronger evidence base.
Method: Q = number of approved references ÷ 10 (capped at 1.0)
Limited — mostly case reports or animal studies
Method: L = mean study-level weight across approved references. Level 1 (meta-analysis / systematic review) = 1.0; Level 2 (RCT) = 0.8; Level 3 (cohort/case-control) = 0.6; Level 4 (case report) = 0.4; Level 5 (animal / in-vitro) = 0.2.
Mixed or neutral — roughly equal benefit and risk signals
Method: D = (sum of risk-scored references − sum of benefit-scored references) ÷ total evidence score, then scaled from [−1, 1] to [0, 1]. 0.0 = pure benefit; 0.5 = neutral; 1.0 = pure risk.
One or more monitoring-level safety signals active
Method: S = 0.5 (neutral baseline) + sum of active signal severity deltas ÷ 10. Severity deltas: Critical = +2.0, High = +1.5, Moderate = +1.0, Low = +0.5. Capped at 1.0.
Final GIRI Score for Andarine (S4). Risk level thresholds: Low 0–3.0 · Moderate 3.0–5.5 · High 5.5–7.5 · Critical 7.5–10.
Full methodology & data sources
The GIRI Score is computed entirely from structured data — no editorial scoring or subjective weighting is applied at any step.
- References: Only approved references are counted. Each reference is assigned an evidence level (L1–L5) and a direction (risk / neutral / benefit) by the reference manager or AI classifier.
- Safety Signals: Sourced from regulatory agencies (FDA, EMA, Health Canada, TGA, and others) and pharmacovigilance databases. Only active signals count toward the score.
- Formula version: GIRI Score v3.7.0 — Q × L × D × S × 10.
- Limitations: The score reflects published evidence and recorded signals as of the last update date. It is not a clinical risk assessment and should not replace advice from a qualified healthcare professional.
Risk Level Classification
Based on available regulatory signals and scientific evidence, this ingredient presents a critical safety concern. Regulatory restrictions or bans are in place in multiple jurisdictions.
0–3.0
3.0–5.5
5.5–7.5
7.5–10
The score pin shows exactly where this ingredient falls on the fixed risk scale.
What drove the Critical classification for Andarine (S4)
A score of 8.5 places this ingredient in the Critical band. Thresholds: Low 0–3.0 · Moderate 3.0–5.5 · High 5.5–7.5 · Critical 7.5–10.
0 approved references.
Limited — mostly case reports or animal studies (Level 4–5).
Neutral or mixed — benefit and risk signals roughly balanced.
No active signals — S component is at neutral baseline (0.5), contributing no extra risk weight.
No major regulatory restrictions or advisories recorded across monitored jurisdictions (FDA, EMA, Health Canada, TGA, and others).
How are the Low / Moderate / High / Critical thresholds defined?
The four risk levels are fixed score bands. A score is assigned to exactly one level based on where it falls:
| Level | Score | Meaning |
|---|---|---|
| LOW | 0.0 – 2.9 | Sparse or predominantly beneficial evidence. No active safety alerts. |
| MODERATE | 3.0 – 5.4 | Mixed signals — some risk alongside benefit. Caution at high doses or in sensitive groups. |
| HIGH | 5.5 – 7.4 | Multiple studies or regulatory alerts documenting adverse effects. Professional oversight recommended. |
| CRITICAL | 7.5 – 10 | Regulatory restrictions in one or more major jurisdictions. Serious documented harm. Avoid without specialist supervision. |
Thresholds are fixed constants (GIRI_Score_Utils::LEVEL_THRESHOLDS). They do not change per ingredient and are never subject to editorial adjustment.