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Hair Growth Serum — KGF + Caffeine + Saw Palmetto
WhollyKaw Hair Growth Serum: KGF, caffeine, saw palmetto, biotin, peptides. 50 ml airless pump. Daily topical for scalp or beard. Alcohol-free, silicone-free. Cosmetic; not a medical claim.
The WhollyKaw Hair Growth Serum is built around three ingredients with published research interest in hair-follicle biology — KGF (keratinocyte growth factor), caffeine, and saw palmetto — supported by a stack of peptides, amino acids, vitamins, and antioxidants. The formula is alcohol-free, silicone-free, and packaged in a 50 ml airless pump for daily topical use.
Quick facts
| Detail | What it is |
|---|---|
| Featured ingredients | KGF (keratinocyte growth factor), caffeine, and saw palmetto extract |
| Format | 50 ml / 1.69 fl oz airless pump |
| Free of | Alcohol, parabens, silicone, nuts, gluten |
| Application | 2–3 pumps after washing, massaged into scalp or beard skin. Once per day. |
| Bottle lasts | ~3 months at daily 3-pump use |
| Price | $45.99 per 50 ml bottle — ≈ $0.51 per day |
The research framing
Pattern hair thinning has been broadly associated in research literature with DHT (dihydrotestosterone) activity at hair-follicle androgen receptors. This formula brings together three ingredients that have been studied in different parts of that research conversation:
- Caffeine — studied in topical contexts for its activity at the follicle.
- Saw Palmetto — studied for its association with 5-alpha-reductase, the enzyme that converts testosterone to DHT in the body.
- KGF (Keratinocyte Growth Factor) — a bio-identical signaling protein with published research in follicle differentiation. Present in fewer than 5% of commercial topicals at this concentration.
The supporting cast (biotin, polypeptides, maca root, B-vitamin complex, antioxidants, amino acids) provides the structural and metabolic context the follicle uses for normal hair-shaft production.
Featured ingredients in detail
KGF — keratinocyte growth factor
Keratinocyte Growth Factor is a bio-identical signaling protein. In the published literature, it has been studied for its role in follicle differentiation and the active growth phase of hair. It is one of the rarer ingredients in commercial topicals because it’s difficult to formulate at meaningful concentration in a stable pump.
Caffeine
Caffeine penetrates the scalp and beard skin readily. It has been studied in topical contexts for its activity at the follicle and is one of the most-researched stimulants in commercial hair-care.
Saw Palmetto extract
Saw Palmetto (Serenoa serrulata) extract has been studied in research contexts for its association with 5-alpha-reductase activity. It is used in this serum as a topical-only botanical — it is not absorbed systemically the way an oral drug would be.
Supporting ingredients
The formulation includes a structural and metabolic supporting cast:
- Biotin — a B-vitamin associated with keratin synthesis. Used at topical concentration here.
- Polypeptides (sh-Polypeptide-3, sh-Polypeptide-107) — bio-identical signaling proteins included in the formula. KGF is one of these; the others contribute to the cellular signaling environment the follicle operates in.
- Maca Root Extract (Lepidium meyenii) — a botanical extract with research interest in the Wnt/β-catenin signaling pathway.
- Amino acids — alanine, arginine, lysine, methionine, and the rest of the structural amino acid stack the follicle uses to build keratin.
- B-vitamin complex — thiamine, riboflavin, niacinamide, B12, folic acid, pantothenate — metabolic cofactors used in normal cellular processes.
- Antioxidants — tocopherols, tocotrienols, astaxanthin, lipoic acid, ubiquinone, grape seed extract — protect the formulation and the application area from oxidative stress.
How to use
After washing the hair, apply two to three pumps to the scalp or to the skin under the beard. Massage into the application area. Number of pumps depends on facial-hair length, texture, and fullness. Style as usual. Use daily or as needed.
The formulation is leave-in — do not rinse out. Patch test before first use. Discontinue if irritation occurs.
What the research describes
The published literature on the featured ingredients spans roughly thirty years. Below is a curated reading list of the most-cited studies in research conversations around hair biology and these specific actives. They describe ingredient mechanisms in research contexts — not consumer outcomes from this product.
Stimulation of Human Hair Growth by the Recombinant Human Keratinocyte Growth Factor-2 (KGF-2)
Keratinocyte growth factor-2 (KGF-2) is found in dermal papilla fibroblasts and its receptor, fibroblast growth factor receptor 2 (FGFR2), in the neighboring outer root sheath of keratinocytes.
Read on PubMed ›Keratinocyte Growth Factor Is Required for Hair Development but Not for Wound Healing
Keratinocyte growth factor (KGF), also known as fibroblast growth factor 7 (FGF7), is synthesized by skin fibroblasts. However, its mitogenic activity is on skin keratinocytes, where it is the most potent growth factor identified thus far.
Read on PubMed ›Keratinocyte Growth Factor Stimulates Migration and Hyaluronan Synthesis in the Epidermis by Activation of Keratinocyte Hyaluronan Synthases 2 and 3
Keratinocyte growth factor (KGF) activates keratinocyte migration and stimulates wound healing.
Read on PubMed ›Keratinocyte Growth Factor Is an Important Endogenous Mediator of Hair Follicle Growth, Development, and Differentiation
The growth and development of hair follicles is influenced by a number of different growth factors and cytokines, particularly members of the fibroblast growth factor (FGF) family.
Read on PubMed ›Keratinocyte Growth Factor Protects Epidermis and Hair Follicles from Cell Death Induced by UV Irradiation, Chemotherapeutic or Cytotoxic Agents
Owing to its potent cytoprotective properties for epithelial cells, keratinocyte growth factor (KGF) is successfully used for the treatment of chemotherapy- and radiotherapy-induced oral mucositis in cancer patients.
Read on PubMed ›Senile Hair Graying: H2O2-Mediated Oxidative Stress Affects Human Hair Color by Blunting Methionine Sulfoxide Repair
Senile graying of human hair has been the subject of intense research since ancient times. Reactive oxygen species have been implicated in hair follicle melanocyte apoptosis and DNA damage.
Read on PubMed ›Who this serum is not for
Honest limitations:
- Sudden, patchy, or irritated hair loss. If hair loss is sudden, patchy, or accompanied by scalp irritation, see a dermatologist before starting any topical product. A topical serum is not a substitute for diagnosis.
- Active scalp conditions. Don’t apply over open cuts, active eczema, untreated psoriasis, or seborrheic dermatitis flares. Treat the underlying skin first.
- Children. No safety data for under-18; this product is for adult use.
- Looking for instant volume. This is a leave-in formulation for daily use. If you want next-shower visible volume, a thickening shampoo or fiber product is the right tool — this is the long-term complement.
Cost per day
One 50 ml bottle at three pumps daily lasts approximately 90 days — about three months of use.
- $45.99 per 90 days ≈ $0.51 per day
- $183.96 for a year of daily application
What’s in the serum
Full ingredient deck:
Water, Lactobacillus/Kelp Ferment Filtrate, PEG-40 Hydrogenated Castor Oil, Propanediol, Glycerin, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Caffeine, Serenoa Serrulata (Saw Palmetto) Fruit Extract, Carnitine, Niacinamide, Lepidium Meyenii Root Extract, Maltodextrin, Alanine, Arginine, Asparagine, Aspartic Acid, Cysteine, Glutamic Acid, Glutamine, Glycine, Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Proline, Serine, Threonine, Tryptophan, Tyrosine, Valine, Biotin, Choline Chloride, Cyanocobalamin, Folic Acid, Inositol, Calcium Pantothenate, Pyridoxine HCl, Riboflavin, Thiamine HCl, sh-Polypeptide-3 (KGF), sh-Polypeptide-107, Superoxide Dismutase, Vitis Vinifera (Grape) Seed Extract, Cocos Nucifera (Coconut) Fruit Juice, Boswellia Serrata Extract, Ubiquinone, Fucoidan, Punica Granatum (Pomegranate) Seed Oil, Tocotrienols, Tocopherols, Astaxanthin, Lycopene, Xanthophyll, R-Alpha Lipoic Acid, Beta-Carotene, Urtica Dioica (Nettle) Leaf/Root Extract, Ammonium Vanadate, Ammonium Molybdate, Calcium Chloride, Copper Sulfate, Ferric Nitrate, Magnesium Chloride, Manganese Sulfate, Potassium Chloride, Sodium Acetate, Sodium Chloride, Sodium Metasilicate, Sodium Phosphate, Sodium Pyruvate, Disodium Selenite, Stannous Chloride, Zinc Sulfate, Adenine, Thymidine, Glucose, Hydroxyethylpiperazine Ethane Sulfonic Acid, Thioctic Acid, Spermidine, Disodium EDTA, Citric Acid, Potassium Hydroxide, Phenoxyethanol, Caprylyl Glycol, Sorbic Acid..
No alcohol. No parabens. No silicone. Made for daily topical use on the scalp or beard skin.
What customers say
★★★★★
High hopes
I love the ingredient list for this hair serum. I'm waiting to see how this plays out. I have faith that I will see improvements in the scalp health and hair structure on my husband's sweet head! It smells great!
★★★★★
Impeccable A+++ Service
I ordered the product for my son, the review on that is pending and will come from him, meanwhile I must compliment the WK team on the promptness and care with which they handle the delivery process from the time the order is placed, till it’s execution and beyond, ensuring a great customer experience and complete satisfaction. I look forward to trying other WK products.
Frequently asked questions
How long is one bottle expected to last?
One 50 ml bottle at 2-3 pumps daily lasts approximately 90 days. At a single-pump application the bottle stretches further; at 4-5 pumps for longer or thicker hair it shortens proportionally.
Where do I apply it?
Massage into the scalp directly, or onto the skin under the beard for facial hair. The formulation is leave-in — do not rinse out. Apply after washing.
Can I use this on my beard?
Yes. Beard hair follicles operate on the same biology as scalp hair, so the same ingredient research applies. Apply to the skin under the beard, not on the hair shafts.
Does it interact with finasteride or minoxidil?
No reports of negative topical interaction in published feedback. Some users layer this serum with minoxidil. If you are on a prescribed treatment, consult the prescribing dermatologist before adding any new topical product.
Is it safe for women?
Yes. The formulation contains no hormonal ingredients; it's appropriate for adult women. Pattern hair thinning in women has different presentation than in men, but the underlying follicle biology is similar.
How often should I apply it?
Once per day, after washing. Topical formulations rely on consistent application; skipping days reduces what the formula can contribute.
Is the formulation tested on animals?
No. WhollyKaw does not test on animals.
Should I expect specific results?
We don't make outcome claims. Hair biology varies person to person, and topical formulations interact with individual genetics, hormonal context, and scalp environment. The research linked on this page describes ingredient mechanisms in laboratory and clinical contexts — not predictions for any specific user. If you are experiencing concerning hair loss, see a dermatologist.