Beauty Best Hair Growth Serum Head to Head: Two Top Picks Compared
The Ordinary Multi-Peptide Serum and Divi Scalp Serum are the two most popular growth serums. One is a budget peptide powerhouse, the other is a clinically tested botanical. Here is how they compare.
| Factor | The Ordinary Multi-Peptide Serum for Hai | Divi Scalp Serum, Clinically Tested Hair |
|---|---|---|
| Hero approach | Multi-peptide complex | Botanical, clinically tested |
| Price | Budget friendly | Mid-range |
| Bottle size | 2 fl oz | 30ml 2-pack |
| Scent | Fragrance free | Light botanical |
| Best for | Value seekers | Sensitive scalps |
| Application | Dropper, nightly | Dropper, nightly |
Our Verdict
The Ordinary wins on price and peptide science. It is the best value in the category. Divi wins for buyers who want clinical testing and a botanical formula. Pick The Ordinary to start affordably. Pick Divi if your scalp prefers gentle plant-based care. Both need 90 days of consistent use.
More Top Picks in This Category
Not sold on either of these two? Here are more bestselling options worth considering.
Best for: Women wanting a clean, vegan thinning-hair routine.
VEGAMOUR GRO Hair Serum for Hair Thinning, 3 Pack, 90 Day Supply
- Plant-based phytoactives plus lactic acid
- Non-greasy water-based formula
- Vegan, cruelty-free, silicone and hormone free
- Clinically tested, color-safe, daily use
Pros
- Clean formula with no hormones
- Will not disturb styled hair
- Bergamot scent is pleasant
Cons
- Highest price in this roundup
- Needs consistent daily application
- 90-day commitment before judging
Best for: Committed users planning a long treatment course.
The Ordinary Multi-Peptide Serum for Hair Density, 2 fl oz, Pack of 2
- Two bottles of the bestselling peptide serum
- Same REDENSYL and Procapil complex
- Ranked #1 in Hair Regrowth Tonics
- Vegan, cruelty-free, silicone-free
Pros
- Better value per ounce than single
- Stock up for a 4-month routine
- Same formula reviewers trust
Cons
- Two bottles is a big upfront cost
- Must stay consistent for results
- Watery texture needs careful dosing
Best for: Women seeking a keratin-enriched thinning-hair serum.
Keranique Hair Growth Activator Serum for Women
- Multi-peptide scalp revitalizer with keratin amino complex
- Peptides plus biotin, clinically tested
- Up to 52% density increase claimed in 45 days
- Fast-absorbing nightly serum
Pros
- Designed specifically for women
- Lightweight, non-greasy feel
- Dermatologist-tested
Cons
- Newer listing with fewer reviews
- Claims need independent verification
- Nightly routine requires discipline
Want the Full Picture?
Postpartum Shedding: The Timeline Nobody Normalizes
Postpartum shedding alarms almost every new mother who experiences it, because no one explains that it is one of the most normal things a body does after birth. During pregnancy, elevated estrogen keeps hairs in the growth phase longer than usual, which is why pregnancy hair looks thick. After delivery, estrogen drops and all those extended-growth hairs enter the shedding phase together, typically starting around month three or four postpartum and peaking around month five. The shedding looks dramatic, handfuls in the shower, but it is the delayed release of hairs that were always going to fall.
What counts as normal versus concerning has clear markers. Normal postpartum shedding is diffuse, all over rather than patchy, and it slows by month six to nine with density recovering over the following year. Concerning signs are smooth bald patches, shedding that worsens past month nine, or loss accompanied by other symptoms like extreme fatigue, which can signal thyroid or iron issues worth testing. While breastfeeding, topical peptide and botanical serums like the ones compared here are generally the preferred option over drug-based treatments, but confirm with your provider. The most useful intervention is patience plus gentle handling: loose styles, minimal heat, and no chemical processes until the shedding stabilizes.
Nutrition and Hair: Honest Evidence Limits
The supplement industry sells certainty the evidence does not support, so here are the boundaries. The deficiencies that genuinely cause shedding are specific and testable: low ferritin, the iron storage marker, is among the most common correctable causes of diffuse shedding in women. Vitamin D and zinc shortfalls appear regularly in shedding workups. These are worth blood-testing before buying any hair product, since correcting a real deficiency outperforms every serum on the market.
Everything else sits on thinner ice. Biotin helps only the rare truly deficient person, which means most biotin gummies do nothing measurable. Collagen supplements get broken down into amino acids by digestion rather than delivered to follicles, so the hair-specific evidence is weak despite the marketing. The hierarchy that respects the evidence: test ferritin, vitamin D, and zinc first, correct what is low, then consider topical serums as support for the scalp environment. Anyone selling you a supplement stack before a blood test is selling in the wrong order. For understanding how topical blockers compare when nutrition is already handled, our DHT blocker vs 5% minoxidil comparison lays out the drug-free and drug-based strategies side by side.
The Topical-Only Stack for Drug-Free Regrowth
For buyers who want to avoid systemic drugs entirely, the topical routine with the best evidence has a clear structure. The foundation is a proven topical growth agent used with total consistency, since sporadic application is the most common reason topicals appear to fail. The highest-value addition is weekly microneedling at 0.5 to 1.0 mm, which the published data shows meaningfully boosts topical response by improving absorption and stimulating the scalp's own repair signals. The third layer is a peptide or botanical density serum like the ones compared here, supporting the scalp environment and reducing the breakage that makes thinning look worse.
Set the ceiling honestly: topical-only routines maintain and moderately thicken, they rarely reverse advanced loss the way combined therapy can, and starting early matters enormously since miniaturized follicles respond better than long-dormant ones. What the stack does reliably is hold the line, improve the look of existing hair, and buy time. Track with monthly standardized photos rather than mirror checks, judge at six months minimum, and keep the routine simple enough to sustain for years, because the best stack is the one you actually do. For the serum layer specifically, our anti loss hair serum guide details how peptide and botanical options differ in approach.