How to Make Oil Serums

For Body, Face & Hair

An oil serum is a blend of carrier oils, active oils, and sometimes essential oils designed to nourish and treat skin or hair. Unlike solid balms, oil serums are 100% liquid and absorb directly into the skin without any wax barrier. Oil serums can target specific concerns like aging, dryness, acne, or dull hair, making them highly customizable for individual needs.

Because they lack water, oil serums do not require traditional broad-spectrum preservatives. However, they are highly susceptible to oxidation. Successful oil serum formulation is less about chemistry and more about matching the fatty acid profile of your oils to the specific needs of the skin or hair being treated.

Standard Composition

Phase	Purpose	Typical %
Base/Carrier Oils	Core moisturizing vehicle	85–98%
Active/Specialty Oils	Targeted treatment benefits	1–10%
Essential Oils	Scent + therapeutic effects	0.5–2%
Antioxidant	Prevents oil rancidity	0.1–0.5%

Heat Sensitivity and Oxidation

Most oil serums can be blended cold, which is ideal as many high-value active oils are heat-sensitive. PUFA-rich oils like Rosehip, Hemp, and Evening Primrose are fragile and should not be heated above 104°F (40°C).

Antioxidants are required to extend shelf life significantly by preventing the chain reaction of oil rancidity. BalmMath analyzes your oil blend's fatty acid profile and calculates the type and amount needed — T50, T95, rosemary oleoresin (ROE), or BHT.

Equipment

Essential:

Digital scale (0.01g)
Dark glass dropper bottles
Stainless steel beakers
Glass stir rods

Optional:

Stainless steel funnel
Graduated pipettes
Nitrogen blanketing spray

Oil Stability & Shelf Life

Oil	Stability	Shelf Life	Best Use
Jojoba	Very High	2+ years	All types; base
Squalane	Very High	2+ years	Sensitive/aging
Rosehip	Low	3–6 mo	Anti-aging face
Hemp Seed	Low	3–6 mo	Oily/acne face
Argan	Medium	12–18 mo	All skin; face
Avocado	Medium	12+ mo	Dry/mature body

Formula Variant Examples

Face Serum (Anti-Aging)

Argan Oil: 40%
Rosehip Seed Oil: 30%
Jojoba Oil: 25%
Antioxidant: per BalmMath (T50, T95, or ROE)
Frankincense & Lavender EO: 1% total

Body Oil (All Skin)

Sweet Almond Oil: 50%
Fractionated Coconut Oil: 30%
Jojoba Oil: 15%
Antioxidant: per BalmMath
Fragrance/EO Blend: 2.5%

Hair Oil (Fine-Medium Hair)

Argan Oil: 40%
Camellia Oil: 40%
Jojoba Oil: 15%
Fragrance/EO: 1.5%
Antioxidant: per BalmMath

Carrier Oils by Skin Type

Oily/Acne-Prone

Focus on high linoleic oils that won't clog pores.

Grapeseed (40%), Hemp (30%), Jojoba (25%), Squalane (5%)

Dry/Mature

Rich, oleic-heavy oils for deep hydration.

Argan (40%), Avocado (30%), Marula (20%), Rosehip (10%)

Sensitive Skin

Ultra-stable, low-irritant oils.

Squalane (50%), Meadowfoam (30%), Oat Oil (20%)

Hair (All Types)

Penetrating and coating oils for shine.

Argan (40%), Camellia (40%), Jojoba (20%)

Manufacturing Steps

Combine Carriers

Weigh your base carrier oils and specialty oils into a sanitized stainless steel beaker.

Add Heat-Sensitive Actives

Ensure the temperature is below 104°F (40°C) before adding your antioxidant, CO2 extracts, or fragile specialty oils.

Add Essential Oils

Stir in your fragrance or therapeutic essential oils last. Mix gently but thoroughly for 2-3 minutes.

Bottle Immediately

Fill dark glass bottles to minimize headspace, which reduces the amount of oxygen trapped inside.

Label and Store

Store finished serums in a cool, dark place. Refrigeration is recommended for PUFA-heavy face serums.

Pro Tip

Sea buckthorn oil (5-10%) adds powerful antioxidants and brightening carotenoids, but will turn your formula bright orange — this is expected and washes off skin. Use sparingly on fair skin or at nighttime to avoid temporary staining.

Troubleshooting

If…	Then…	Solution
Oil feels too greasy on skin	Carrier oils are too heavy or slow-absorbing	Increase lightweight oils like Squalane, Jojoba, or FCO; decrease Avocado or Olive oil.
Scent disappears quickly	Fragrance is mostly top notes	Add more base notes (Sandalwood, Vanilla, Patchouli) to fix the scent.
Oil develops a 'crayony' smell	The oils have oxidized (gone rancid)	Discard. Use fresh oils and ensure you add the recommended level of antioxidant (ROE or Tocopherol).
Serum is cloudy	Moisture contamination or temperature drop	If moisture, discard. If cold, warm gently to 104°F (40°C) to re-dissolve.

Formulate with BalmMath

Choose 'Oil Serum' in BalmMath to analyze your fatty acid profile and calculate exact antioxidant requirements.

BalmMath Calculator