Key Takeaways

• The Function of Beauty Custom Hair Serum is a styling and conditioning product built for frizz control, shine, and heat protection.
• The base formula uses sunflower seed oil, jojoba oil, and silicones across all versions, with personalization from the hair quiz adding goal-specific boosters rather than fundamentally changing the active ingredient profile.
  
• Function of Beauty reports a 70% reduction in frizz after one application and 26x more shine compared to untreated hair, but these are cosmetic improvements to the hair's appearance, not structural changes in hair density or regrowth.
  
• For anyone whose primary concern is hair thinning rather than styling, the Trybello Hair Helper Spray and Vegamour GRO Hair Serum are two scalp-level alternatives that directly target follicle health.
• Trybello Hair Helper Spray delivers biotin, sophora flavescens, ginger, rice water, caffeine, and castor oil directly to the scalp in a lightweight, vegan formula free of hormones, silicones, and parabens.

What Is the Function of Beauty Custom Hair Serum?

The Function of Beauty Custom Hair Serum is a 3 oz leave-in styling treatment that smooths frizz, adds shine, and shields hair from heat damage up to 400°F. It is built on a base of conditioning oils and silicones and applied to the mid-lengths and ends of the hair, not the scalp, which defines both what it does well and what it cannot do.

That distinction matters for anyone searching with thinning or shedding in mind. A product that coats the strand can improve how existing hair looks and feels, but it does not reach the follicle where density and regrowth are determined.

For adults whose priority is scalp-level support, alternatives like our Trybello Hair Helper Spray and the Vegamour GRO Hair Serum are formulated to work at the root rather than the surface.

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Join over 100,000 happy customers who've transformed their hair with our doctor-formulated spray in just 12 weeks, rated 4.8/5 by 40,000+ real users.

Proven Natural Ingredients

• • Caffeine Extract – Blocks DHT and boosts blood flow to follicles
• • Biotin – Direct scalp absorption, no pills needed
• • Castor Oil – Soothes inflammation and locks in moisture
• • Rice Water Extract – Strengthens hair and reduces shedding

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Function of Beauty Hair Serum Ingredients

Sunflower Seed Oil

Sunflower seed oil is rich in linoleic acid, an omega-6 fatty acid that helps reinforce the hair's lipid barrier. This supports cuticle smoothing, which is a key factor in the serum's frizz reduction and shine. It's a lightweight oil that absorbs without leaving a greasy residue, making it suitable for fine or medium hair types.

Jojoba Oil

Jojoba oil is technically a liquid wax, which makes it structurally similar to the natural oils produced by the skin. In a leave-in serum applied to the mid-lengths and ends, it provides moisture and softness without weighing strands down. It works alongside sunflower seed oil to maintain hydration between washes.

Silicones

Function of Beauty confirms the Custom Hair Serum contains silicones, which coat the surface of the hair to deliver shine and smoothness. Silicones are also the primary source of the serum's heat protection up to 400°F. They create a barrier that reduces moisture loss during thermal styling.

Function of Beauty Hair Serum Results

Function of Beauty's Custom Hair Serum is personalized, but the base formula across all versions centers on conditioning oils and silicones for styling.

Frizz Control & Shine

Function of Beauty reports 70% frizz reduction after one application, along with 26x more shine than untreated hair. For anyone dealing with dry, unruly, or humidity-prone hair, those numbers are meaningful. They're consistent with what a silicone-based serum with conditioning oils delivers when it seals the cuticle effectively.

Heat Protection

The serum provides heat protection up to 400°F, which covers most professional-grade flat irons, curling wands, and blow dryers. Applied to the mid-lengths and ends before styling, the serum creates a protective layer that reduces direct contact between the hair shaft and the tool's surface.

Function of Beauty tailors each formula to the customer's hair type. A few drops worked through mid-lengths and ends are typically enough to deliver coverage across most hair lengths.

What the Serum Cannot Do for Thinning or Shedding

The Function of Beauty Custom Hair Serum is a conditioning and styling product. It does not contain ingredients that directly target the hair follicle, such as caffeine extract, saw palmetto, or peptide complexes used in dedicated hair growth treatments. The serum is applied to the hair strand, not the scalp, which means it cannot address the root causes of thinning or excessive shedding.

Alternatives to Function of Beauty Custom Hair Growth Serum

1. Trybello Hair Helper Spray

Unlike styling serums, our Trybello Hair Helper Spray is designed for scalp application, targeting hair health at the follicle level.

Our Trybello Hair Helper Spray is a leave-in topical formula applied directly to the scalp, designed to target the root causes of thinning and shedding rather than coat the hair surface. The formula is built around botanicals and naturally derived actives, each chosen for a specific role in supporting hair at the follicle level.

Sophora Flavescens Extract is one of the formula's standout ingredients, studied for its effects on scalp hormone balance, including DHT, the hormone most commonly linked to pattern hair thinning. Ginger extract works as an anti-inflammatory botanical that improves scalp circulation and helps create a healthier environment for growth.

Biotin supports keratin production, the protein that makes up the structure of each hair strand, helping new growth come in thicker and more resilient. Rice water, rich in inositol and amino acids, strengthens hair from within and supports a healthier scalp environment.

The full formula also includes caffeine, which extends the anagen (active growth) phase, giving hair more time to grow before shedding, and castor oil, which is rich in ricinoleic acid and helps lock in scalp moisture while soothing inflammation.

The spray is applied with 2 to 3 pumps directly to the scalp once or twice daily, with visible results reported in as little as 4 weeks, with significant results by week 8. It's vegan, cruelty-free, and free from hormones, silicones, and parabens.

2. Vegamour GRO Hair Serum

Vegamour GRO Hair Serum is a plant-based scalp treatment designed to support thicker, fuller-looking hair over time. The formula centers on three phyto-actives: mung bean seed extract, red clover seed extract, and turmeric plant stem cells, each targeting a different aspect of follicle health. Mung bean supports follicle stimulation, red clover contains isoflavones studied for their role in counteracting DHT-related thinning, and the turmeric stem cells contribute antioxidant and anti-inflammatory support at the scalp level.

The formula also includes caffeine, biotin, and Oligopeptide-2 as supporting actives. It's applied via dropper directly to the scalp, used daily, and Vegamour recommends at least 90 days of consistent use before evaluating results. The serum is vegan, cruelty-free, and lightweight with a non-greasy finish.

Top Alternatives to Function of Beauty Hair Serum: Summary Table

Why the Trybello Hair Helper Spray Wins for Healthier, Stronger Hair

Results from a Trybello Hair Helper Spray customer after consistent use, showing noticeable improvement in hair fullness and volume.

The Function of Beauty Custom Hair Serum delivers on its styling promises: frizz reduction, shine, and heat protection. But if your concern is thinning or shedding, a styling serum won't address what's happening at the root.

Our Trybello Hair Helper Spray is designed to do what a styling serum cannot: deliver growth-supporting ingredients such as caffeine, biotin, sophora flavescens, and ginger directly to the scalp, where thinning begins. The spray format makes daily application simple and doesn't interfere with the rest of your styling routine. Give your hair 120 days with the Trybello Hair Helper Spray and let your results speak for themselves.

Frequently Asked Questions (FAQs)