Loxstar Hair Growth Serum: A Visual Guide to the Current Formula

The ingredient list on a bottle of Loxstar Peptide Hair Growth Serum runs to 38 names. Read in order, it looks like a chemistry exam. Sorted by job, it is seven layers. At the center is RCP, three branded blends that share three jobs at the follicle: start new growth, hold the follicle, and turn down the DHT signal. Around that core sit four support layers aimed at the same follicle, a conditioning layer for scalp and hair, and the base that makes it a light serum you can use every day.

What "peptide hair serum" means here

A peptide is a short chain of amino acids, the same building blocks that make up proteins. Some peptides act as signals in skin and hair tissue, and cosmetic chemists build versions that mimic those signals. Loxstar's list contains two: acetyl tetrapeptide-3 (from Capixyl) and biotinoyl tripeptide-1 (from Procapil). Neither is a copper peptide: GHK-Cu is a different molecule and is not in this formula. Our copper peptides guide explains the difference.

So "peptide serum" describes the formula's two signature molecules, not the whole bottle. The rest is plant extracts, supporting actives and the ingredients that carry them.

The formula on one page

A quick orientation before the layers. The follicle is the small organ under the skin that makes each hair. At its base, the dermal papilla sends the signals that start and sustain growth. Follicles cycle between a growing phase (anagen) and a resting phase (telogen). In pattern hair loss, DHT, a hormone made from testosterone by the enzyme 5-alpha-reductase, gradually shortens growing phases and shrinks susceptible follicles. Every layer below is aimed somewhere on that map.

Layer 1: RCP, the core

RCP is not one ingredient. It is three blends from three ingredient makers, and you will not find their trade names on the label: each appears as its separate parts.

Swipe to see all four columns →

Start new growth. Redensyl's main active is a larch polyphenol (dihydroquercetin glucoside) that its maker developed to activate the reserve stem cells along the follicle and the dermal papilla, the cells that decide whether a new growing phase begins. Green tea, glycine and zinc round out the blend.

Hold the follicle. A growing hair needs a secure anchor in the surrounding tissue. Both peptides target the proteins that provide it: acetyl tetrapeptide-3 supports collagens and laminins in the matrix around the follicle, and biotinoyl tripeptide-1 (GHK with biotin attached) reinforces the follicle's own border.

Turn down the DHT signal. Red clover extract, standardized to biochanin A, and oleanolic acid both act on 5-alpha-reductase at the scalp. Procapil's apigenin adds support for the follicle's local blood supply.

The three blends were each studied by their makers over three to four months, and the full combination was compared with 5% minoxidil in a 24-week trial in which 106 men completed treatment. Our RCP guide walks through every study and the follicle biology behind each job.

Layer 2: AnaGain, the growth-phase signal

Pisum Sativum (Pea) Sprout Extract is AnaGain, made by the Swiss ingredient maker Mibelle. Its target is the switch from resting to growing. In a 2020 study in Phytotherapy Research, Grothe and colleagues applied a fluid with 2% pea sprout extract twice a day to a test patch at the back of the scalp in 10 volunteers for two weeks, then analyzed plucked hairs. Two growth-cycle genes rose: FGF7, a growth factor linked to the cells that build a new hair, by 56%, and noggin, which blocks a signal that keeps follicles resting, by 85%.

In the framework above, AnaGain backs the first job: getting a new growing phase started.

Layer 3: Liposomal caffeine, follicle energy

The product page calls it liposomal caffeine; the list shows it as Caffeine and Phospholipids. Phospholipids are the molecules that form cell membranes, and in a formula they can assemble into liposomes, tiny spheres that carry an ingredient.

Caffeine's hair research starts in the lab. Fischer and colleagues (International Journal of Dermatology, 2007) took follicles from scalp biopsies of 14 men with pattern hair loss and kept them growing in culture for five to eight days. Testosterone slowed hair-shaft growth; adding caffeine counteracted that slowdown, and caffeine on its own increased growth. Reviewers describe the proposed mechanism as raising a cell-energy messenger (cAMP) that supports cell division in the follicle.

In the framework, caffeine backs the DHT job from a different side: in the lab it kept follicles growing despite testosterone.

Layer 4: Melatonin, growing-phase support

Melatonin is best known as the sleep hormone, but hair follicles respond to it too. In a 2004 pilot trial in the British Journal of Dermatology, Fischer and colleagues had 40 women with pattern or diffuse hair loss apply a 0.1% melatonin solution or a placebo once a day for six months. Trichograms, counts of plucked hairs sorted into growing and resting, showed a higher share of growing hairs with melatonin in specific scalp areas and groups. Blood melatonin stayed within the body's normal nighttime range.

In the framework, melatonin backs the first job by supporting the growing phase.

Layer 5: Botanicals, scalp support

Eight plant ingredients support the scalp around the follicle:

• Rosmarinus Officinalis (Rosemary) Leaf Extract. Rosemary's best-known study, by Panahi and colleagues (Skinmed, 2015), compared rosemary oil with 2% minoxidil in 100 people over six months; hair counts rose in both groups by month six, with no significant difference between them and less scalp itching in the rosemary group. That trial used the oil. Loxstar uses the leaf extract.
• Panax Ginseng Root Extract. Ginseng was one of four ingredients, with acetyl tetrapeptide-3, red clover and sage oil, in a tonic that 32 adults applied twice daily to the crown for 24 weeks against 3% minoxidil. Terminal hair counts rose in both groups with no significant difference between them (Lueangarun and Panchaprateep, Journal of Clinical and Aesthetic Dermatology, 2020).
• Ginkgo Biloba Leaf Extract. Described for its antioxidant properties and support of microcirculation.
• Withania Somnifera (Ashwagandha) Root Extract, Emblica Officinalis (Amla) Fruit Extract, Centella Asiatica (Gotu Kola) Extract, Aloe Barbadensis (Aloe Vera) Leaf Extract and Quercetin Extract. Traditional and antioxidant plant ingredients included to support a calm, healthy scalp environment.

The product page highlights ginseng, ginkgo, quercetin and amla among its "6 Additional Research-Backed Ingredients", together with vitamin B5 and hyaluronic acid from the next layer. Each botanical will get its own explanation in a future Journal guide.

Layer 6: Conditioners for scalp and hair

• Wheat Amino Acids, Soy Amino Acids, Arginine HCl, Serine and Threonine: amino acids, the building blocks of proteins, which also help skin and hair hold moisture.
• Panthenol (Provitamin B5): a humectant (an ingredient that draws in and holds water) and conditioner for scalp and hair fiber.
• Sodium Hyaluronate: the salt form of hyaluronic acid, which holds water at the skin surface.

These do not take one of the three core jobs. They keep the scalp comfortable and the hair in good condition while the actives work, which matters for something you apply every day.

Layer 7: The base

Most of a serum is the liquid that carries the actives. Several base ingredients arrive inside the RCP blends themselves.

• Purified Water and Butylene Glycol: the solvent system that dissolves the actives.
• Glycerin: a humectant, supplied with Redensyl.
• Dextran: a sugar-based carrier, supplied with Capixyl.
• PPG-26-Buteth-26 and PEG-40 Hydrogenated Castor Oil: solubilizers that keep plant actives evenly dispersed in a water-based serum, supplied with Procapil.
• Sodium Metabisulfite: an antioxidant that protects the Redensyl actives.
• Phospholipids: the liposome builders for caffeine (layer 3).
• Phenoxyethanol, Ethylhexylglycerin and Sodium Benzoate: the preservative system that keeps an opened, water-based bottle safe through daily use. The product page lists the formula as paraben-free with no artificial fragrances or colors.

Why the layers belong in one bottle

A thinning follicle has more than one weak point. DHT shortens its growing phases, its anchoring matrix weakens, and its restart signals slow. One active cannot cover all of that, which is why RCP divides the three core jobs among three blends, with two ingredients on the anchoring job and two on the DHT job.

The support layers stack on that core. AnaGain and melatonin back the growing phase, caffeine supports the follicle itself, and the botanicals and conditioners look after the scalp the whole formula sits on. The base makes it a light, non-greasy serum that is practical to apply every day, because the research on these actives measured results over three to six months of steady use. If you are weighing this kind of formula against minoxidil, our peptide serum vs. minoxidil guide compares the two directly.

The full ingredient list, by layer

Here is every ingredient in the order printed on the product page, with its layer. Notice that each RCP blend's parts sit together: that is how they arrive from the maker.

Swipe to see both columns →

How it fits your routine

The whole formula is one step. The product page directions: "Apply once daily to clean scalp after showering. Use dropper to place pea size on thinning areas, massage for 30 seconds, then let dry for 5 minutes before styling." After a shower is the easiest time, but any clean, dry scalp works: you do not need to wash before every application. Apply Loxstar before any styling product.

Because every layer works on the follicle's cycle, results build over months; the product FAQ recommends at least 90 days of daily use. If your hair is long or dense, our scalp application guide shows how to get the serum onto skin rather than strands.