Commercial hair growth serums often contain a handful of effective ingredients diluted in a lot of filler — and they charge a significant amount for the packaging and marketing. The active ingredients themselves are inexpensive and available individually. These DIY recipes deliver the same active compounds in concentrated form, at a fraction of the cost.
Thank you for reading this post, don't forget to subscribe!Three serums and two masks — each targeting a different aspect of hair growth: scalp circulation, DHT blocking, follicle activation, and structural hair strengthening.
3 DIY Hair Growth Serum Recipes
Serum 1 — Rosemary and Peppermint Growth Serum (Most Effective)
This is the most research-backed DIY serum available. Rosemary oil blocks 5-alpha reductase (the enzyme that converts testosterone to DHT, the hormone responsible for follicle miniaturization). Peppermint oil increases scalp circulation. A clinical trial comparing rosemary oil to minoxidil found comparable hair count increases at 6 months.
Ingredients: 2 tablespoons jojoba oil, 10 drops rosemary essential oil, 5 drops peppermint essential oil, 3 drops cedarwood essential oil (optional — supports follicle stimulation).
How to use: Apply 8 to 10 drops directly to the scalp using a dropper. Massage in for 3 minutes. Leave on — do not rinse. Apply every evening or every other evening. Store in a dark glass dropper bottle. Results at 8 to 12 weeks.
Serum 2 — Castor Oil and Biotin Scalp Serum
Castor oil’s ricinoleic acid activates prostaglandin E2 receptors that promote hair growth. Biotin in liquid form delivers directly to the follicle rather than through digestion.
Ingredients: 1 tablespoon castor oil, 1 tablespoon argan oil (to thin the castor oil), 1 crushed biotin tablet dissolved in 1 teaspoon warm water, 5 drops lavender essential oil.
How to use: Apply to scalp sections 2 to 3 times per week. Massage for 5 minutes. Leave overnight, wash out in the morning. Use castor oil sparingly if you have fine hair — it can build up.
Serum 3 — Green Tea and Onion Juice Serum (Budget Option)
Green tea’s EGCG inhibits 5-alpha reductase and promotes dermal papilla cell proliferation — the cells that control hair follicle activity. Onion juice contains sulfur compounds that support keratin synthesis and improve scalp circulation.
Ingredients: half a cup strong cooled green tea, 2 tablespoons fresh onion juice (blend quarter onion and strain), 5 drops rosemary essential oil.
How to use: Apply to scalp with a cotton ball or spray bottle. Leave for 30 minutes. Rinse thoroughly — the onion smell dissipates completely after washing. Use 3 to 4 times per week. Most affordable serum on this list.
2 DIY Hair Growth Mask Recipes
Mask 1 — Egg and Castor Oil Protein Mask
Eggs provide complete protein including all essential amino acids needed for keratin synthesis. Castor oil adds follicle stimulation. Honey adds humectant moisture.
Ingredients: 2 eggs (whole), 1 tablespoon castor oil, 1 tablespoon raw honey, 5 drops rosemary essential oil.
How to use: Whisk all ingredients together. Apply to dry hair from scalp to ends. Cover with a shower cap. Leave for 30 minutes minimum. Rinse with cool water first — hot water cooks the egg. Then shampoo normally. Use once a week. Results in 4 to 6 weeks of consistent use.
Mask 2 — Avocado and Fenugreek Growth Mask
Avocado provides biotin, vitamins D and E, and healthy fats that support hair structure. Fenugreek seeds contain diosgenin, a compound that stimulates hair growth and reduces DHT.
Ingredients: half a ripe avocado (mashed smooth), 2 tablespoons fenugreek paste (soak seeds overnight, blend to paste), 1 tablespoon coconut oil, 1 tablespoon yogurt.
How to use: Mix all ingredients. Apply to scalp and hair. Cover with a shower cap. Leave for 45 minutes. Rinse and shampoo. Use once a week. The fenugreek gives a faint curry-like scent that washes out completely.
The Short Version For daily serum use: rosemary and peppermint in jojoba oil, applied every evening to the scalp without rinsing. For weekly mask: egg and castor oil protein mask for growth and strength. For budget option: green tea and onion juice serum 3 to 4 times a week. All three together in rotation covers circulation, DHT blocking, protein supply, and follicle activation.
