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Shop Medix 5.5 Booster Serum 3% Hyaluronic Acid
Serum
Medix 5.5

Booster Serum 3% Hyaluronic Acid

~$18· 1.7 Fl Oz (Pack of 1)

What it's good for

Key actives from our research database. Click any to read the full evidence dossier.

  • Centella AsiaticaModerate evidenceFull dossier ↗

    Also called "cica," it calms redness, repairs the skin barrier, and speeds up recovery. The go-to for irritated or reactive skin.

    Good for: Anti-inflammatory, Barrier repair

  • ChamomileModerate evidenceFull dossier ↗

    The classic "tea-bag-on-puffy-eyes" botanical. Calms angry skin via well-studied anti-inflammatory pathways, gently. Good for reactive or rosacea-prone complexions.

    Good for: Anti-inflammatory, Antioxidant

  • DimethiconeStrong evidenceFull dossier ↗

    A silicone that sits on your skin as an invisible, non-greasy shield. Reduces water loss, protects against irritants (think soap, friction, incontinence), and is FDA-recognised as a skin protectant from 1-30%. The reason your favourite primer feels silky and your barrier cream actually works under makeup.

    Good for: Barrier repair, Hydrating

  • EGCG (Green Tea)Strong evidenceFull dossier ↗

    A polyphenol from green tea that calms UV-triggered redness and reinforces your sunscreen as a second line of antioxidant defense.

    Good for: Antioxidant, Anti-inflammatory, Sun protection

  • GlycerinModerate evidenceFull dossier ↗

    A workhorse hydrator that pulls water into your skin. In nearly every good moisturizer for a reason.

    Good for: Hydrating

  • Hyaluronic AcidStrong evidenceFull dossier ↗

    A pure hydrator that holds water in your skin. Makes skin look plumper and smoother almost immediately.

    Good for: Hydrating

  • Phytic AcidModerate evidenceFull dossier ↗

    A plant-derived acid that blocks the enzyme your skin uses to make pigment, fading dark spots and post-acne marks. Clinical trials show it measurably reduces hyperpigmentation and improves skin luminosity, with significantly less irritation than stronger AHAs. A good option for sensitive skin that still wants a brightening acid.

    Good for: Brightening, Antioxidant, Exfoliating

New to this? Patch test on your inner arm for 24 to 48 hours before applying to your face. If you have sensitive skin or rosacea, start 2 to 3 times per week and build up slowly.

Evidence behind the ingredients

Real citations from our research database, one per tracked active in this product. Click any ingredient name to read its full evidence dossier.

Centella AsiaticaModerate evidence6 citations

Also called "cica," it calms redness, repairs the skin barrier, and speeds up recovery. The go-to for irritated or reactive skin.

Hur N et al., A Randomized, Double-Blind, Placebo-Controlled Trial Assessing the Effects of Oral Centella asiatica Extract on Skin Aging-Related Parameters in Middle-Aged Korean Women, Nutrients 2026

2026Positive (efficacy)PMID:42196964View source ↗

Borowicz KK et al., Geroprotective Potential of Centella asiatica: Modulation of Cellular Aging, Nutrients 2026

2026Mechanism onlyPMID:42280293View source ↗

Witkowska K et al., Topical Application of Centella asiatica in Wound Healing: Recent Insights into Mechanisms and Clinical Efficacy, Pharmaceutics 2024;16(10):1252 — modern hydrogel and nanostructured Centella delivery systems accelerate wound healing across wound types

2024Meta-analysis (positive)PMID:39458583View source ↗
ChamomileModerate evidence6 citations

The classic "tea-bag-on-puffy-eyes" botanical. Calms angry skin via well-studied anti-inflammatory pathways, gently. Good for reactive or rosacea-prone complexions.

Essential Oil of Matricaria chamomilla Alleviates Psoriatic-Like Skin Inflammation by Inhibiting PI3K/Akt/mTOR and p38MAPK Signaling Pathway, Clinical Cosmetic and Investigational Dermatology 2024

2024Mechanism onlyPMID:38222858View source ↗

Comparative analysis of whole plant, flower and root extracts of Chamomilla recutita L. (Germany), Frontiers in Immunology 2024

2024Mechanism onlyPMID:38720895View source ↗

Xu J et al., Therapeutic effects of chamomile volatile oil nanoemulsion/Bletilla striata polysaccharides gels on atopic dermatitis, International Journal of Biological Macromolecules 2024 — topical chamomile volatile oil nanoemulsion (19.07 nm) reduced skin damage, epidermal thickness, and mast cell infiltration in atopic dermatitis mice; rebalanced Th1/Th2

2024Positive (efficacy)PMID:39111460View source ↗
DimethiconeStrong evidence5 citations

A silicone that sits on your skin as an invisible, non-greasy shield. Reduces water loss, protects against irritants (think soap, friction, incontinence), and is FDA-recognised as a skin protectant from 1-30%. The reason your favourite primer feels silky and your barrier cream actually works under makeup.

Beeckman D, Verhaeghe S, Defloor T, et al. A 3-in-1 perineal care washcloth impregnated with dimethicone 3% versus water and pH neutral soap to prevent and treat incontinence-associated dermatitis: a randomized, controlled clinical trial. J Wound Ostomy Continence Nurs. 2011;38(6):627-634.

2011Positive (efficacy)PMID:21952346View source ↗

Saary J, Qureshi R, Palda V, et al. A systematic review of contact dermatitis treatment and prevention. J Am Acad Dermatol. 2005;53(5):845-855. (Barrier creams containing dimethicone prevent irritant contact dermatitis.)

2005Meta-analysis (positive)PMID:16243136View source ↗

FDA OTC Final Monograph, 21 CFR Part 347 — Skin Protectant Drug Products for Over-the-Counter Human Use; dimethicone listed at section 347.10 as a Category I active ingredient at 1-30%.

2003Regulatory approval21CFR347.10View source ↗
+4 more ingredients
EGCG (Green Tea)Strong evidence7 citations

A polyphenol from green tea that calms UV-triggered redness and reinforces your sunscreen as a second line of antioxidant defense.

Detudom P, Kamanamool N, Paichitrojjana A, Udompataikul P, Udompataikul M, Efficacy of anti-sebum moisturizing cream containing 2% l-carnitine and 5% epigallocatechin gallate in seborrhea, Journal of Cosmetic Dermatology 2023;22(11):3058-3064 — Thai RCT showed EGCG-containing cream significantly reduced sebum and improved hydration in seborrhea

2023Positive (efficacy)PMID:37194909View source ↗

Ud-Din S et al., A Double-Blind, Randomized Trial Shows the Role of Zonal Priming and Direct Topical Application of Epigallocatechin-3-Gallate in the Modulation of Cutaneous Scarring in Human Skin, Journal of Investigative Dermatology 2019;139(8):1680-1690 — topical EGCG reduced scar thickness weeks 1-3 and increased elasticity at week 4 vs placebo

2019Positive (efficacy)PMID:30822414View source ↗

Kim YR et al., Clinical Evaluation of a New-Formula Shampoo for Scalp Seborrheic Dermatitis Containing Rosa centifolia + EGCG: A Randomized Double-Blind Controlled Study, Annals of Dermatology 2014;26(6):733-8 — EGCG-containing shampoo matched ketoconazole and zinc pyrithione efficacy; faster erythema response than 1% zinc pyrithione

2014Positive (efficacy)PMID:25473226View source ↗
GlycerinModerate evidence6 citations

A workhorse hydrator that pulls water into your skin. In nearly every good moisturizer for a reason.

Danby SG et al., Different types of emollient cream exhibit diverse physiological effects on the skin barrier in adults with atopic dermatitis, Clinical and Experimental Dermatology 2022;47(6):1154-1164 — glycerol+urea emollient delivered superior barrier-strengthening and irritant protection

2022Positive (efficacy)PMID:35167133View source ↗

Youssef R et al., Glycerol 85% efficacy on atopic skin and its microbiome: a randomized controlled trial, Journal of Dermatological Treatment 2021;32(7):730-736 — topical glycerol 85% RCT on atopic skin

2021Positive (efficacy)PMID:31869257View source ↗

Evans NJ et al., Human axillary skin condition is improved following incorporation of glycerol into the stratum corneum from an antiperspirant formulation, Archives of Dermatological Research 2017;309(9):739-748 — 4% glycerol penetrated axillary SC, reduced irritation, improved hydration

2017Positive (efficacy)PMID:28889318View source ↗
Hyaluronic AcidStrong evidence7 citations

A pure hydrator that holds water in your skin. Makes skin look plumper and smoother almost immediately.

Karabat MU, Tuncer MC. Effects of hyaluronic acid on skin at the cellular level: a systematic review. Rev Assoc Med Bras. 2025;71(8):e20250208. — Systematic review of 45 studies found low-molecular-weight HA stimulates keratinocyte proliferation and migration while high-molecular-weight HA drives skin hydration, supporting topical HA as an effective skin-hydrating and barrier-supporting ingredient.

2025Meta-analysis (positive)PMID:40990743View source ↗

Bravo B et al., Benefits of topical hyaluronic acid for skin quality and signs of skin aging: From literature review to clinical evidence, Dermatology and Therapy 2022;12(12):2657-2680 — HA-based cosmeceuticals reliably improve hydration and signs of skin aging

2022Meta-analysis (positive)PMID:36200921View source ↗

Lee SG et al., Hyaluronan Oligosaccharides Improve Rosacea-Like Phenotype through Anti-Inflammatory and Epidermal Barrier-Improving Effects, Annals of Dermatology 2020

2020Mechanism onlyPMID:33911737View source ↗
Phytic AcidModerate evidence3 citations

A plant-derived acid that blocks the enzyme your skin uses to make pigment, fading dark spots and post-acne marks. Clinical trials show it measurably reduces hyperpigmentation and improves skin luminosity, with significantly less irritation than stronger AHAs. A good option for sensitive skin that still wants a brightening acid.

Markiewicz-Tomczyk A et al., Clinical Evaluation of Anti-Aging Effects of Combined Therapy - Azelaic Acid, Phytic Acid, and Vitamin C Applied Layer by Layer in Females, Journal of Cosmetic Dermatology 2022

2022Positive (efficacy)PMID:36056802View source ↗

Houshmand EB. Effect of glycolic acid, phytic acid, soothing complex containing emulsion on hyperpigmentation and skin luminosity: a clinical evaluation. J Cosmet Dermatol. 2021;20(3):776-780.

2021Positive (efficacy)PMID:33458927View source ↗

Sarkar R et al. Comparative Study of 35% Glycolic Acid, 20% Salicylic-10% Mandelic Acid, and Phytic Acid Combination Peels in the Treatment of Active Acne and Postacne Pigmentation. J Cutan Aesthet Surg. 2019;12(3):158-163.

2019Positive (efficacy)PMID:31619887View source ↗

Sources: 10 clinical journals and regulatory databases across the US, EU, Korea, Japan, and China. Every entry points to a specific document. See methodology for the full list and what each outcome label means.

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