Kérastase Nutri-Supplement Scalp Serum is a dry-scalp moisturizing product with a milky texture and leave-in directions. The official information reviewed for this guide specifies two to four doses on damp or dry scalp, followed by massage. It does not turn a dose into a stated milliliter quantity, and its hydration evidence should not be treated as a hair-density result.
Find the Scalp Product in the Nutritive Range
The official product information archived September 30, 2026 identifies the 90ml Nutri-Supplement Scalp Serum. The range's 8H Magic Night Serum is a different product for hair lengths.
Check the complete name and application area on your regional package. A Nutritive logo or a nighttime routine shared online cannot tell you whether the product in question belongs on the scalp or on dry ends.
Decide Whether Dry-Scalp Moisture Is the Goal
A tight, dry-feeling scalp presents a different purchase question from rough lengths or a widening part. Nutri-Supplement's documented role is moisture and nourishment for a dry scalp.
The word nutritive should not be interpreted as treatment of a nutritional deficiency. If loss is progressing or the scalp is persistently inflamed, ask for an assessment rather than assuming a richer serum will identify or correct the cause.
For the dry-scalp product itself, the Nutritive Nutri-Supplement formula review separates its moisture claims from hair-length products in the same range.
Swipe the table sideways to compare all columns.
| Decision | Documented detail | Purchase implication |
|---|---|---|
| Product | 90ml scalp serum | Separate from 8H length serum |
| Use | Two to four doses; leave in | No guessed milliliter conversion |
| Results | Instrumental moisture and consumer perception | Not a density claim |
Read the Milky Formula before Choosing the Texture
The archived ingredient list includes water, glycerin, mineral oil, amodimethicone, niacinamide, panthenol and fragrance. It is a formulated emulsion-like care product rather than pure oil or a medication.
These details make texture and ingredient preference concrete. A reader avoiding fragrance should check the complete list; a reader seeking an oil-free product should not infer that property from a non-greasy marketing claim. A pleasant finish and ingredient identity are separate pieces of information.
Follow Two to Four Doses without Inventing Milliliters
The official page says to apply two to four doses on dry or damp scalp, massage and leave in. It also describes blow-drying as appropriate after use. The retrieved wording does not establish an exact dose volume.
Do not translate doses into an arbitrary drop count. If the current applicator has a marked measurement or the local package gives more precise instructions, use those details. A dose from Genesis or another Kérastase product is not automatically the Nutri-Supplement dose.
For the separate everyday-care choice, review the 30ml Lightweight Scalp Serum with Ginger.
Compare Separate Moisturizing Textures
These GinGrowth choices have their own formulas and do not reproduce Kérastase study results. GinGrowth sells the two products below.
Swipe the table sideways to compare all columns.
| Detail | 30ml Lightweight Scalp Serum with Ginger | 40ml Ginger Hair Tonic for Scalp & Roots |
|---|---|---|
| Format | Water-based dropper essence | Water-based dropper tonic |
| Ingredient highlights | Aqua, glycerin, ginger root oil, Polygonum multiflorum extract and hydroxyethylcellulose in the ingredient graphic. | Ginger extract, glycerin, sodium PCA and panthenol, alongside aqua, in the product artwork. |
| Application | After washing and drying, apply a small amount to the scalp, massage gently and leave in. The product guide describes daily use. | Part hair, apply a small amount, massage gently for 2–3 minutes and leave on. Follow the current bottle for frequency. |
| Reason to compare | Choose for a light moisturizing step and precise placement along a part. | Choose for a larger dropper format with humectant and conditioning ingredient highlights. |
View 30ml Lightweight Scalp Serum with Ginger or compare 40ml Ginger Hair Tonic for Scalp & Roots. Review the current product page for price and package details.
The essence contains ginger root oil within a water-based formula. That is different from buying a bottle of pure essential oil. Glycerin provides a concrete moisturizing ingredient to compare, while the dropper helps direct a small amount to the scalp. Use the finish on your own hair as the practical test: controlled placement matters more than saturating the roots or spreading scalp care through the lengths.
Glycerin and sodium PCA are moisture-binding ingredients, while panthenol is used for conditioning. The highlighted ingredient graphic is not a percentage breakdown. The word tonic describes this product choice; it does not establish a stronger concentration than the smaller essence. Compare the ingredients you prefer and whether direct dropper placement feels convenient in your routine.
Keep the Product on Its Intended Area
Sectioning can help reach the scalp without soaking the hair over it. The practical aim is distribution consistent with the package, not saturation of every strand. More visible wetness does not prove more nourishment.
Keep length conditioner on the area and for the contact time specified by its own label. Buying a scalp serum does not require turning a rinse-out conditioner into another leave-on scalp layer.
Read the Immediate Moisture Result Carefully
The official main product information reports up to 23% more scalp moisture immediately after application, with an instrumental-test footnote. The same page's FAQ uses hair-moisture wording for that percentage, so the source contains an endpoint inconsistency.
This guide retains the main scalp-moisture claim while making that conflict visible. Neither wording establishes 23% more hair, 23% less shedding or a lasting regrowth result. Ask the brand for the underlying protocol if that precise measurement drives the purchase.
For the moisture-focused decision, comparing hydrating scalp serums explains humectants, finish and the difference between scalp hydration and length conditioning.
Keep the One-Week Consumer Results Separate
A separate self-assessment involved 31 men and women with dry scalp over one week. The page reports 100% finding the texture non-greasy, 89% satisfied and 86% feeling the scalp nourished.
Those responses describe perceptions among the study participants. They are not the instrumental moisture measurement, and satisfaction should not be translated into universal tolerance. Your hair, other styling layers and application amount can affect the experience.
Compare Water-Based GinGrowth Choices
GinGrowth's essence and tonic below are separate moisturizing formats sold by GinGrowth. They offer a way to compare ingredient highlights and direct dropper placement with a milky scalp serum.
No study shown here establishes identical hydration performance. If the specific Nutritive texture and documented claims are your reasons for buying, preserve that distinction. If ordinary moisture is the need, choose on the alternative's own label rather than borrowing Kérastase's percentages.
Fit the Routine around Existing Treatment
If you already use a scalp medicine, follow its instructions and ask about adding a cosmetic. Do not dilute medication into the serum, replace a prescribed application or assume that using both simultaneously improves either result.
Stop a cosmetic that worsens irritation. Persistent itching, scaling or pain may need a different approach from added moisture. The AAD's scalp-itch guidance explains why the cause matters.
Frequently Asked Questions
Is Nutri-Supplement the same as 8H Magic Night Serum?
No. Match the full product name and application area; one is scalp care and the other is a separate length-care product.
Does 100% non-greasy mean nobody can find it heavy?
No. It is a response in a small, specified consumer study, not a guarantee for all routines.
Can I use another serum's pipette measurement?
No. The dose should come from the current Nutri-Supplement package, not a different product.
Judge Moisture as Moisture
Use comfort, manageable roots and formula fit as the relevant cosmetic observations. Keep the exact package information for a repeat purchase and compare results under similar wash and styling conditions. If the question is continuing hair loss, obtain a cause-specific plan instead of treating a short hydration study as a growth deadline.
Choose the care role and formula that match your routine.
Sources and Product Information
- Kérastase Nutri-Supplement: dated official product information — Official snapshot dated September 30, 2026; source endpoint inconsistency disclosed.
- AAD: Hair loss diagnosis and treatment — Guidance checked October 1, 2026; not a trial of the cosmetics compared here.
- AAD: Causes of scalp itch — Guidance checked October 1, 2026.
GinGrowth product details were checked October 1, 2026. This guide compares published information and current product specifications; it does not report a GinGrowth clinical trial or personal use test.