Sh-Oligopeptide-9 for Hair Regrowth - Quick Reference Sheet
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Sh-Oligopeptide-9 for Hair Regrowth

Created on 08/01/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 4.8 – Audit

A lab-made copy of a natural skin-signaling molecule, sold as a minor ingredient in "growth factor" scalp serums for thinning hair. No studies test it alone for hair, and its best-known action actually slows cell growth. Safety looks favorable, mostly occasional scalp irritation. Overall, an unproven add-on dominated by uncertainty. (Full Review)

Protocol

Application
Once–twice daily
Leave-on serum to scalp; peptide rarely sold alone
With Microneedling
Every 2–4 weeks
Applied immediately after in-clinic sessions
Timing
Morning
On clean, dry scalp; consistency over timing
Time to effect
Visible Change
3–6 months
Set by the hair cycle, not the peptide
Reassess
3 & 6 months
Standardized photos vs. baseline
Stop Point
6 months
Discontinue if photos show no benefit

Benefits

Contraindications
  • Pregnancy or breastfeeding
  • Active scalp infection or open wounds
  • Scarring or inflammatory scalp disease
  • History of scalp skin malignancy
    •
Key Interactions
  • Opioid antagonists (naltrexone, naloxone, low-dose naltrexone)
  • Other topical growth factors/peptides (EGF, IGF-1, FGF, VEGF, copper peptides)
  • Retinoids, exfoliating acids, benzoyl peroxide
  • Microneedling / fractional laser
    •

Risk & Side Effects

  • Low: Application-site irritation and contact dermatitis
    •
  • Speculative: Paradoxical anti-proliferative signaling; immunogenicity and allergic sensitization; residual endotoxin and manufacturing impurities
    •

Monitoring

Marker Target Why
Ferritin 40–70 ng/mL Low iron stores drive diffuse shedding
Vitamin D (25-OH) 40–60 ng/mL Deficiency linked to hair-cycle disruption
TSH 1.0–2.0 mIU/L Thyroid dysfunction causes resting-phase shedding
DHT Reference-range Principal driver of pattern loss the peptide does not address
Zinc 90–110 µg/dL Deficiency associated with hair shedding

Cadence: Baseline before starting; recheck abnormal labs every 3–6 months until corrected

Qualitative Assessment

  • Perceived hair density and scalp coverage on fixed-lighting photos
  • Daily shed count (shower and pillow hair) trend
  • Hair-pull test at follow-up visits
  • Scalp comfort (itch, irritation, redness) as a tolerability signal
  • Ponytail circumference or part-width, where applicable
Not medical advice. Educational distillation of a single evidence review. Confirm any decision with a qualified clinician, especially in the presence of prescription drugs or chronic conditions.