Beauty The Ordinary Hair Oil Guide: How to Use Serums Right Now
An educational guide from the Beauty AMZ research team. No hard sell, just what you need to know.
How the Peptide Serum Works
Signal peptides communicate with scalp skin at a cellular level. They support a healthier environment around the follicle. Better follicle conditions help existing hair look denser. The water-based formula absorbs without clogging. Daily application maintains the signaling effect. This is long-game scalp care, not a quick fix.
How to Build Your Scalp Routine
Cleanse with the gentle sulphate cleanser. Apply hydrating serum to any dry or flaky areas. Follow with the peptide serum across thinning areas. Use the peptide serum every night. Track progress with monthly photos.
How to Apply Serums Correctly
Part hair to expose the scalp in sections. Apply drops directly to the scalp, not the hair. Massage gently with fingertips for one minute. Let each layer absorb before adding the next. Do not rinse afterward. Use at night for maximum contact time.
Mistakes to Avoid
Applying to hair instead of scalp wastes the product. Expecting regrowth on bald areas sets up disappointment. Quitting after three weeks misses the real timeline. Layering too many actives irritates the scalp. Skipping sunscreen on a parted scalp risks sunburn.
Maintaining Scalp Health
Keep using the peptide serum even after seeing results. Manage stress, which triggers shedding. Eat enough protein and iron. Avoid tight hairstyles that strain follicles. See a dermatologist if shedding suddenly worsens.
Recommended Products
These are the best The Ordinary hair oil picks on Amazon right now.
Best for: Thinning hair needing density support.
The Ordinary Multi-Peptide Serum for Hair Density 2 oz
- Peptide complex for hair density
- Water-based, non-greasy
- Apply daily to dry scalp
- Transparent ingredient percentages
Pros
- Science-first density support
- Excellent price for peptides
Cons
- Needs 3 months of patience
- Not for fully bald areas
Best for: Dry, tight, flaky scalps.
The Ordinary Natural Moisturizing Factors and Hyaluronic Acid Scalp Serum 2 oz
- Hydrates dry, flaky scalps
- NMF plus hyaluronic acid
- Calms tightness and itch
- Layers under peptide serum
Pros
- Fast relief for dry scalp
- Gentle, fragrance-free
Cons
- Small bottle for frequent use
- Needs reapplication
Best for: Gentle frequent washing.
The Ordinary Sulphate 4% Cleanser for Body and Hair 8.1 oz
- Gentle 4% sulphate cleanser
- For hair and body
- Suits sensitive scalps
- Pairs with scalp serums
Pros
- Gentle but effective cleansing
- Simplifies shower routine
Cons
- Low lather takes adjusting
- Not for heavy buildup days
Ready to Choose?
See our top product picks for the ordinary hair oil, or jump straight to the head-to-head comparison of the two most popular options.
Using The Ordinary Serums Alongside Minoxidil
Many people using the Multi-Peptide Serum for Hair Density also use minoxidil, and the two can share a routine with the right order. Apply minoxidil first to a clean, dry scalp, since it is the medical treatment and needs direct skin contact to absorb. Wait at least 30 minutes for it to dry before layering any other product, because wet layering dilutes absorption and can increase irritation. The Ordinary serums then go on as the second layer, with the Natural Moisturizing Factors plus Hyaluronic Acid scalp serum first if the scalp feels dry, followed by the peptide serum. Watch for irritation stacking: minoxidil already causes flaking and itch in some users, and adding exfoliants like the Sulphate 4 percent cleanser on the same day can tip a sensitive scalp over the edge. If irritation appears, drop back to minoxidil alone for a week, then reintroduce one Ordinary product at a time. For the peptide serum on its own, our main Ordinary hair oil page covers the standalone routine.
The First Weeks: Normal Flaking Vs A Red Flag
Starting any scalp active comes with an adjustment period, and knowing the difference between normal settling-in and a bad reaction saves a lot of worry. Mild, fine flaking in the first one to two weeks is common with scalp serums, as the skin speeds up cell turnover and sheds the old layer. This should fade by week three. A red flag looks different: spreading redness, burning that lasts more than an hour after application, raised bumps, or itching that gets worse each use. Those mean stop, not push through. Introduce one product at a time with a week between each, so you can identify the culprit if a reaction appears. The Sulphate 4 percent cleanser is the most likely irritant of the three products on this page, so patch test it first and keep it away from broken or freshly scratched skin. Compare the three formulas and their roles in the top model comparison.
How To Patch Test Scalp Products
Scalp skin hides under hair, which makes patch testing awkward but still necessary. Apply a small amount of the product behind one ear or along the hairline at the nape, where the skin is similar to scalp skin and a reaction stays easy to see. Leave it for 48 hours without washing the spot, and avoid layering other new products there during the test. A mild tingle in the first minutes that fades is usually fine. Redness that spreads, swelling, persistent burning, or small bumps mean the product does not suit you. Test the cleanser and each serum separately, not all three at once, or a reaction tells you nothing. This two-day test is the cheapest insurance in any scalp routine, and it takes less time than treating a full-scalp reaction. The background guide on The Ordinary hair oils has more on how these formulas behave across hair types.