• ACTIIV Thickening Hair Serum Water-Based 1.8 oz plant-based hair and scalp serum for thicker, fuller-looking hair
  • key benefits for actiiv water-based thickening hair serum
  • Instructions on how to use actiiv water-based thickening hair serum with a bottle, application on hair, and a smiling person.
  • Bottle of actiiv water-based thickening hair serum with product feature icons on a beige background
  • Before and after comparison of a person's hairline using a water-based hair serum.
  • Three key ingredients for water-based thickening hair serum displayed with coffee beans, red clover flowers, and green tea leaves.

Thickening Hair Serum - Water Based

ACTIIV Thickening Hair Serum transforms your daily routine into a targeted scalp care ritual — designed to strengthen follicles, optimize scalp, and improve hair density.
Its clean, water-based formula absorbs instantly, delivering lightweight nourishment and noticeable results with every use. Ideal for straight to wavy hair or those with extensions.

Size:

90 Day Guarantee

  • Thickens and strengthens hair with a lightweight, fast-absorbing water-based formula
  • Targets areas of concern to support denser, fuller-looking hair over time
  • Improves strand strength and resilience, reducing breakage and shedding

Step 1 — Start with wet or dry hair

Step 2 — Apply Serum Directly to Scalp
Using the precision dropper, apply 1 full dropper directly onto areas of focus — typically along the hairline, crown, or areas experiencing thinning.
Part the hair to expose the scalp and distribute evenly with fingertips.

Step 3 — Massage to Activate
Massage gently for 30–60 seconds to help evenly spread the serum.
Do not rinse — this leave-in formula is designed for full absorption.

Step 4 — Style as Usual
Allow a few minutes for the serum to absorb fully before styling. For best results, use daily.

Water (Aqua), Aloe Barbadensis Leaf Juice, Glycerin, Trifolium Pratense Flower Extract, Pisum Sativum (Pea) Sprout Extract, Epilobium Fleischeri Extract, Caffeine, Hydrolyzed Quinoa, Hydrolyzed Adansonia Digitata Seed Extract, Camellia Sinensis Leaf Extract, Serenoa Serrulata Fruit Extract, Hippophae Rhamnoides Fruit Extract, Curcuma Longa Root Extract, Genista Tinctoria Flower/Leaf/Stem Extract, Cucurbita Pepo Seed Extract, Rosmarinus Officinalis Leaf Extract, Polysorbate 20, Isomalt, Xanthan Gum, Fragrance (*)Gluconolactone, Sodium Benzoate, Potassium Sorbate, Citric Acid.

Individuals noticing early signs of thinning or shedding who want a clean, lightweight serum to support thicker, fuller-looking hair.

Top: Mint, Orange, Plum, Bergamot
Middle: Rose, Mate, Violet Nutmeg
Bottom: Vanilla, Oakmoss, Sandalwood, Amber

Plant-Based, Scalp-Focused Ingredients

Caffeine ingredient icon from ACTIIV hair care, supporting invigorated scalp and stronger hair roots. Caffeine ingredient icon from ACTIIV hair care, supporting invigorated scalp and stronger hair roots.

Caffeine

Helps to invigorate the scalp, support healthy microcirculation, deliver essential nutrients, and promote the appearance of stronger hair.

Red Clover botanical ingredient icon in ACTIIV hair care, used for antioxidant support and scalp nourishment. Red Clover botanical ingredient icon in ACTIIV hair care, used for antioxidant support and scalp nourishment.

Red Clover

Rich in natural compounds, it helps maintain a clean-feeling, balanced scalp for healthier-looking hair.

Green tea botanical ingredient icon featured in ACTIIV hair care for antioxidant and scalp-refreshing benefits. Green tea botanical ingredient icon featured in ACTIIV hair care for antioxidant and scalp-refreshing benefits.

Green Tea

Rich in polyphenols and antioxidants, it helps protect the scalp from external stressors.

Your Questions Answered, Before You Buy

A lightweight daily leave-in scalp serum that delivers plant thickening actives between washes. Designed to complement the Recover system — keeping active ingredients on the scalp on non-wash days.

Water-Based: ideal for fine, straight, or low-porosity hair.

Oil-Based: ideal for textured, coily, or high-porosity hair. Both deliver the same thickening actives — choose by hair type.

No. The water-based formula absorbs quickly and leaves zero residue—perfect for those who dislike the feel of oils.

Most users notice less shedding within 6–8 weeks and visibly fuller-looking hair within 3–6 months. Continued daily use maintains and enhances results.

Yes. Apply the serum first, let it absorb, then use your styling or heat-protective products as usual. It’s color-safe and scalp-safe.

Absolutely. Use Recover or Renew to cleanse and prepare the scalp, then apply the serum daily between washes to keep scalp nourishment active.

Related Products