Hair Serums

Targeted care, without adding weight. Discover hair serums selected to support the scalp and lengths with lightweight formulas designed for concerns like dryness, breakage, frizz and growth-focused routines. Easy to layer into your existing haircare, these are the treatment steps that do a little more.

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  • Intensive Hair Serum

    Regrow Intensive Hair Serum

    Regrow Intensive Hair Serum
    $69.00
    $69.00
  • Curated Set • Hair Growth Routine

    Regrow Curated Set • Hair Growth Routine

    Regrow Curated Set • Hair Growth Routine
    $132.00
    $132.00
  • Noche Balancing Scalp Sérum

    San Margo Noche Balancing Scalp Sérum

    San Margo Noche Balancing Scalp Sérum
    $72.00
    $72.00

Hair serums are designed to deliver targeted care in lightweight, easy-to-layer formulas. Depending on the product, they may be used on the scalp to support a more consistent growth-focused routine, or through the lengths to help smooth, soften and improve the look and feel of dry or stressed hair.

At Vault, we curate hair serums across a range of needs, from scalp-focused treatments and intensive hair serums to smoothing formulas designed to reduce the appearance of frizz and add polish. Some are made for daily use, while others work best as part of a more structured treatment routine.

Choosing the right serum comes down to where you want to focus. If scalp care is the priority, look for a formula designed to be applied at the roots. If you are more concerned with dryness, flyaways or breakage through the lengths, a smoothing or strengthening serum may be the better fit.

Frequently Asked Questions

What does a hair serum do?

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A hair serum is a targeted treatment that can be used on the scalp or lengths depending on the formula. It may help support scalp care, smooth frizz, add softness or improve the appearance of dry or damaged hair.

Are hair serums good for hair growth?

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A hair serum is a targeted treatment that can be used on the scalp or lengths depending on the formula. It may help support scalp care, smooth frizz, add softness or improve the appearance of dry or damaged hair.

Should hair serum be applied to wet or dry hair?

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It depends on the product. Scalp serums are often applied directly to the roots, while smoothing serums may be used on damp or dry lengths. Check the individual instructions.

Can I use hair serum every day?

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Many hair serums are suitable for regular use, but frequency depends on the formula. Treatment serums may have specific usage directions, so it is best to follow the product guidance.

What is the difference between hair serum and hair oil?

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Hair serums are often lighter and more treatment-focused, while hair oils tend to focus more on nourishment, softness and shine. Some products can offer overlapping benefits.