Evidence Supporting Ingredients for Optimal Scalp Health

Strength of Evidence: High

Glycerin is a well-established humectant with extensive dermatological evidence supporting its role in skin and scalp barrier hydration.

Evidence overview

Human studies demonstrate that glycerin:

    •    Increases stratum corneum hydration

    •    Reduces transepidermal water loss (TEWL)

    •    Improves barrier resilience and comfort

These effects are particularly relevant to the scalp, where dehydration and barrier disruption contribute to itching, flaking, and sensitivity.

Our Pharmacist’s Interpretation:

Glycerin provides foundational scalp hydration and barrier support and is one of the most reliable, evidence-based ingredients for maintaining scalp comfort across skin types.

Strength of Evidence: Moderate - High 

Salicylic acid is a keratolytic agent widely used in dermatology to manage scaling and surface buildup.

Evidence overview

Clinical evidence shows that low-concentration salicylic acid:

    •    Promotes gentle exfoliation of the scalp

    •    Helps reduce visible flaking and product buildup

    •    Improves penetration of other scalp-applied ingredients

When appropriately formulated, it supports scalp clarity without excessive irritation.

Our Pharmacist’s Interpretation:

In rinse-off formulations, salicylic acid supports scalp hygiene and comfort by reducing surface scale and congestion, particularly in dandruff-prone or buildup-prone scalps.

Strength of Evidence: Moderate

Aloe vera has demonstrated soothing and anti-inflammatory properties in human skin studies.

Evidence overview

Published data indicate that aloe:

    •    Helps calm irritated skin

    •    Supports hydration and comfort

    •    May reduce subjective itch and erythema

Our Pharmacist’s Interpretation:

Aloe serves as a supportive ingredient for sensitive or reactive scalps, contributing to comfort rather than acting as a primary therapeutic agent.

Strength of Evidence: Moderate

Marine algae extracts are rich in minerals, polysaccharides, and antioxidant compounds.

Evidence overview

Human and ex-vivo data suggest that marine algae:

    •    Support skin hydration

    •    Provide antioxidant protection

    •    Contribute to scalp conditioning and comfort

Our Pharmacist’s Interpretation:

These extracts support the scalp environment by improving hydration and surface conditioning, aligning with long-term scalp health rather than direct hair growth stimulation.

Strength of Evidence: Moderate

Ingredients such as sorbitol and guar hydroxypropyltrimonium chloride contribute to hydration, conditioning, and reduced mechanical irritation.

Our Pharmacist’s Interpretation:

These components improve scalp and hair feel, reduce friction, and support overall cosmetic scalp comfort.

What the evidence supports:

    •    Glycerin: Strong evidence for scalp hydration and barrier support

    •    Salicylic acid: Moderate–high evidence for scale reduction and scalp clarity

    •    Aloe vera: Moderate evidence for soothing and comfort

    •    Marine algae extracts: Moderate supportive evidence for hydration and conditioning

Overall strength of evidence:

High (glycerin) | Moderate–High (salicylic acid) | Moderate (aloe, marine extracts)

Overall Scientific Summary

When assessed using available human clinical evidence:

    •    The OptiOptu Organic Shampoo supports scalp health by prioritising hydration, gentle exfoliation, and barrier comfort.

    •    The formulation focuses on maintaining a healthy scalp environment rather than making unsupported hair growth claims.

    •    This approach aligns with clinical principles that a calm, well-hydrated scalp improves tolerance and outcomes of additional hair treatments when used.

Medical & Regulatory Notice

This information is based on peer-reviewed scientific literature and is provided for educational purposes only. Individual response may vary. The OptiOptu Organic Shampoo is a cosmetic product intended to support scalp comfort and hygiene and is not intended to diagnose, treat, cure, or prevent medical conditions.

For personalised hair or scalp concerns, consultation with a qualified healthcare professional is recommended