Common Name(s): Hydroxyisoleucine,hydroxyisoleucine,(4r)-hydroxyisoleucine,fenugreek amino acid insulin sensitiser
CAS Number: N/a
DESCRIPTION
What It Does: Provides insulin sensitisation activity through insulin receptor substrate (irs-1) phosphorylation improving glucose uptake in adipocytes — a mechanism relevant to anti-cellulite formulations targeting improved metabolic function in subcutaneous fat.
Why It's Used: Hydroxyisoleucine's insulin-sensitising mechanism provides anti-cellulite benefit through a lipid metabolism pathway completely different from caffeine (camp/pde) or carnitine (beta-oxidation) — enabling genuine multi-mechanism anti-cellulite formulation.
How It Works: (4r)-hydroxyisoleucine directly phosphorylates irs-1 at tyr465 (an insulin receptor substrate site) → pi3k activation → glut4 translocation to cell membrane → increased glucose uptake in adipocytes → reduced lipid accumulation. this insulin mimetic activity is independent of the insulin receptor itself providing additive benefit with endogenous insulin signalling.
Typically Found In: Anti-cellulite,body slimming,metabolic skin care
TECHNICAL DETAILS
Primary Category: Active ingredient – antioxidant
Secondary Functions: Free radical scavenging,anti-aging
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.1%–2%
SOURCING & ETHICS
Vegan Status: Yes
Halal Status: Yes
Source Notes: Plant-derived extract or synthetic.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 – very low
Comedogenicity Rating: 0/5 – non-comedogenic
Sensitivity Concerns: Non-irritating; well-tolerated.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Excellent safety profile. ewg score: 1.
Works Well With: Vitamin c,vitamin e,ferulic acid,spf,other antioxidants
Avoid Combining With: No significant incompatibilities
SCIENTIFIC NOTE
Hydroxyisoleucine's specificity for adipocyte irs-1 versus muscle irs-1 phosphorylation provides targeted anti-cellulite activity — the r stereoisomer is responsible for activity; racemic mixtures have reduced potency.
Last Verified: 2026-03-22
Primary Sources: Cosing database,(4r)-hydroxyisoleucine fenugreek insulin sensitiser anti-cellulite review