Beauty The Ordinary Hair Care Guide: Oils, Serums And Pro Tips
An educational guide from the Beauty AMZ research team. No hard sell, just what you need to know.
The Ordinary's hair philosophy
The Ordinary applies its skincare philosophy to hair: clinical ingredients, honest concentrations, low prices. No luxury markup, no miracle claims. The Multi-Peptide serum lists its actives transparently. The oils are single-ingredient and pure. This approach appeals to ingredient-savvy shoppers. You pay for formulas, not marketing. The trade-off is minimal hand-holding. You must research and choose yourself. Informed buyers get exceptional value. The philosophy rewards education.
How peptide serums work
Peptides are short protein chains that signal skin and scalp processes. Redensyl targets stem cells in the follicle bulge. Procapil combines biotinyl-GHK with plant extracts. Baicapil supports follicle anchoring. Caffeine stimulates scalp microcirculation. Together they create a better growth environment. Results appear gradually over months. The science is promising but not miraculous. Consistent nightly use is essential. Understanding the mechanism sets proper expectations.
Squalane versus argan for hair
Squalane is weightless, fast-absorbing and ideal for fine hair. Argan oil is richer, with vitamin E for deeper nourishment. Squalane rarely causes buildup or limpness. Argan gives more dramatic softness to coarse hair. Both are single-ingredient and pure. Choose squalane for daily shine on fine to medium hair. Choose argan for weekly nourishment of dry, thick hair. Neither replaces a scalp treatment. Match the oil weight to your hair density.
Building a routine
Nightly: apply peptide serum to a clean, dry scalp. Massage and leave overnight. Wash days: shampoo gently, condition as usual. Post-wash: smooth squalane or argan over damp ends. Between washes: touch up dry ends sparingly. Weekly: assess scalp comfort and adjust. Monthly: photograph progress for the serum. Keep the routine simple and consistent. Complexity kills compliance. Simple routines win over time.
Common mistakes
Expecting serum results in two weeks leads to quitting early. Using the serum on oily, unwashed scalps reduces absorption. Mixing the serum with heavy scalp oils blocks the peptides. Over-applying finishing oils causes limpness. Skipping the 90-day commitment wastes the investment. Buying all three products without a plan creates confusion. Ignoring irritation signals risks scalp damage. Patience and simplicity prevent most mistakes. Follow the plan, not your impulses.
Recommended Products
These are the products our research team rates highest in this category.
Best for: Budget buyers wanting pure argan oil for hair ends.
The Ordinary 100% Organic Cold-Pressed Moroccan Argan Oil, Nourishing and Hydrating Treatment for Skin & Hair, 1 Fl Oz
- 100% organic cold-pressed argan oil
- Use on hair for softness and sheen
- Unrefined with natural scent
- 1 fluid ounce bottle
Pros
- Pure argan at a drugstore price
- Versatile for hair and skin
Cons
- Natural scent not for everyone
- Small bottle for daily hair use
Best for: Thinning-hair shoppers wanting the famous peptide density serum.
The Ordinary Multi-Peptide Serum for Hair Density, Peptide-Powered Formula for Thicker, Fuller Looking Hair, 2 Fl Oz
- Peptide serum for hair density
- Number 1 in hair regrowth tonics
- Water-based, silicone-free formula
- 2 fluid ounce bottle
Pros
- Cult favorite with huge review base
- Affordable density serum
Cons
- Serum, not an oil, despite the cluster name
- Needs months of nightly use
Best for: Fine-haired users wanting the lightest possible hair oil.
The Ordinary 100% Plant-Derived Squalane, for Skin and Hair, Lightweight Hydration, and Moisture Barrier Support, 1 Fl Oz
- Pure plant-derived squalane
- Weightless hydration for hair and skin
- Non-comedogenic, daily use
- 1 fluid ounce dropper
Pros
- Cheapest way to try squalane on hair
- Never greasy when used sparingly
Cons
- Very light, not a deep treatment oil
- Dropper bottle is small
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.
Scalp-only clarifying for serum and oil routines
The Ordinary's hair lineup mixes scalp serums, like the Multi-Peptide Serum for Hair Density, with sealing oils like the argan oil and squalane, and each type creates different buildup. Peptide serums leave water-soluble residue that rinses fairly easily, while argan and squalane leave lipid film that accumulates at the scalp over weeks. A scalp-only clarify every two to three weeks clears both without stripping the lengths you have been treating.
Apply the technique the same way each time: conditioner on the ends as a shield, clarifier massaged into the scalp for sixty seconds, rinse carrying everything down. Time it for the wash before your next peptide serum application, since serums absorb best into freshly clarified skin. If the scalp starts itching between resets, move the clarify a week earlier rather than adding more oil, which only feeds the buildup. Our apple cider vinegar rinse guide offers a lighter reset for the in-between weeks.
Natural rinses versus commercial clarifiers, honestly compared
An apple cider vinegar rinse handles light mineral film and adds shine, but it cannot dissolve the silicone and lipid layers that build up from regular argan oil and squalane use. Baking soda scrubs more aggressively yet risks cuticle damage with its high pH, a bad trade for anyone using peptide serums to improve hair quality. Rhassoul clay sits in the middle, decent at absorbing excess oil, weak against mineral deposits.
Use naturals for maintenance and keep a commercial clarifier for the real resets. A monthly ACV rinse keeps hard-water film from compounding, while a true clarifying shampoo every six weeks does the heavy lifting the rinse cannot. Check any clarifier's label for a chelating agent like disodium EDTA before buying, since chelation is what separates mineral removal from plain deep cleansing. For choosing between oil types in the first place, our hair serum comparison breaks down which formulas build up fastest.