Olaplex No. 0.5 Scalp Longevity Treatment Review | SkinSourcer
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The Shelf · Hair · Root Cause: Scalp Care That Comes Before the Hair

Olaplex No. 0.5 Scalp Longevity Treatment
No. 07 in Edit 058

Olaplex No. 0.5 Scalp Longevity Treatment

Scalp USA Approx. $44

The bond-building brand's first scalp product, and the same patented molecule from No. 3 is fourth on the list, here alongside rice bran oil, arginine and glycerin for the skin rather than the strand. The applicator parts the hair for you.

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Why we like the No. 0.5 Scalp Longevity Treatment

  • The Olaplex molecule, applied to the scalp
  • Rice bran oil and glycerin
  • The applicator
  • Forty four dollars
Texture
A weightless serum with a needle-nose applicator
Key ingredients
Bis-aminopropyl diglycol dimaleate · Rice bran oil · Arginine · Glycerin
Fragrance
Not stated. No parfum in the published list.
Best for
Dry, tight scalps · Olaplex users who stopped at No. 3 · Two or three times a week
Works on
Scalp dryness · Sensitivity · Dullness
Made in
USA
Where to buy
Dermstore
Price when checked
$44 on 2026-09-09
Listing checked
2026-09-06

Our verdict on the Olaplex No. 0.5 Scalp Longevity Treatment

If you stopped at No. 3, this is the scalp bottle you missed. Two or three times a week, not daily.

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Where the No. 0.5 Scalp Longevity Treatment sits on The Shelf

Nine scalp care products arranged on a shelf Edit 058 · ROOT CAUSE Root Cause: Scalp Care That Comes Before the Hair Salicylic acid, peptides and a bond builder, all aimed at the skin under the hair.

The rest of Root Cause: Scalp Care That Comes Before the Hair

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Reviewed 2026-09-06. Olaplex No. 0.5 Scalp Longevity Treatment appears in Root Cause: Scalp Care That Comes Before the Hair. Every product on The Shelf is listed in the product index.