If you have spent any time near K-beauty on your feed, you will have seen serums sold as "microneedling in a bottle". A July 2026 round-up in Us Magazine reported the pitch at its most ambitious: the results of microneedling, without the appointment, the downtime or the sting.
Spicules may well help some ingredients get further into skin, and a spicule serum may be a reasonable cosmetic for some people. But "microneedling in a bottle" is marketing rather than a finding. We found no human trial comparing the two, and the physical gap between them is large.
A disclosure before going further: we offer microneedling in our clinics, so we have an interest here. We have tried to hold both sides to the same standard, and one reasonable conclusion from this article is that you need neither.
Spicule skincare vs microneedling at a glance
| Spicule skincare | Professional microneedling | |
|---|---|---|
| What it is | Cosmetic containing tiny needle-shaped particles | Clinic procedure using a sterile, single-use needle cartridge |
| Depth | Far shallower: one study measured 48.6 micrometre channels, in pig skin | Nominal needle length of 0.5 to 3.0 mm; actual penetration is less |
| Human evidence | A few small studies, mostly commercially linked | Randomised trials, device trials and biopsy work, mostly small and short |
| New collagen in people | No human biopsy study found | Shown in small biopsy studies |
| Head-to-head trial | We found none | We found none |
| Common effects | Redness, prickling, tingling | Redness, pain, peeling |
| Reported cost | Around £27 to £49 for 30 to 50ml | Broadly £145 to £300 a session |
Both price lines are indicative. The serum range is for one line sold in the UK, VT Reedle Shot, as reported by a price comparison site at the time of writing. The session range comes from clinic marketing pages, and can reach £400 for doctor-led scar work.
What spicules are and how they are thought to work
Spicules are tiny needle-shaped particles. A 2026 American Academy of Dermatology conference abstract puts them at about 100 to 250 micrometres long and 7 to 12 wide, made from siliceous sponge or biodegradable materials such as hyaluronic acid.
That is the first catch. The word covers different materials, and a study of one should not be applied to another. "Hydrolysed sponge" on a label adds to the confusion: we found no published analysis of retail products showing whether such an ingredient contains intact needle-shaped particles, or at what length and dose.
The proposed mechanism is physical. The particles open tiny channels in the top layer of skin, so more of whatever is applied with them gets in. This is the best supported part of the story, with a large caveat: almost all of it comes from pig skin and mice, usually with large molecules and labelled tracers rather than a finished cosmetic.
The 2020 study linked by that Us Magazine piece reported exosome absorption in pig skin rising "by a factor of 5.87", but involved no human testing, and its corresponding author reports patents. In people, the best functional sign we found is a lidocaine pilot trial saying spicules "halved the onset time of lidocaine". That is one signal from one abstract, its size and design could not be read, and the work was commercially supported.
So increased delivery is plausible. Whether a retail active from a retail bottle gets further into human facial skin is unknown.
Does a spicule serum do what the phrase implies?
Microneedling works by injury. Its channels reach the dermis and set off a three-phase wound-healing process. The phrase "microneedling in a bottle" implies something similar is happening at home. There are three gaps.
Depth
A 2019 paper in Biomaterials Science measured sponge spicule channels of 48.6 micrometres in pig skin. Professional microneedling uses a nominal needle length of 0.5 to 3.0 mm, and needle penetration is not equal to needle length, since skin tenting and pressure reduce it. Those figures are not like for like, but they point one way: spicules are far shallower. Dermatologists quoted in US shopping features, which earn commission from product links, broadly say the same. Treat that as opinion.
Collagen
We found no human biopsy study of spicules showing new collagen. Microneedling has this kind of data, though not much of it: one study of 10 people found significant increases in collagen types I, III and VII after six sessions at 1.5 mm.
Trial evidence
The strongest human study we found is Ha 2017, a randomised split-face trial in 20 healthy volunteers. Its spicules were soluble hyaluronic acid carrying a growth factor (EGF), not sponge, so it is not evidence for retail serums.
The spicule side showed "a 30.1% increase in dermal density" from baseline, and density favoured it over EGF cream at weeks 4 and 8. Yet on wrinkle grading, "there was no significant difference in the grades between the two groups". EGF was on both sides, application differed between them, blinding was not reported, and follow-up ran only 8 weeks. Paean Biotechnology provided funding alongside a government grant, and the paper says the company took no part in data analysis.
A 2025 study in the International Journal of Molecular Sciences followed 21 women for two weeks with no comparator, using spicules coated in a stem cell secretome. Three authors had company affiliations, and they call their results "preliminary and hypothesis-generating rather than definitive evidence of clinical efficacy". We found no peer-reviewed trial of any VT product.
Those authors also list, as future work, that "Head-to-head comparisons with microneedling or fractional lasers would also benchmark spicules against reference procedures". We found no such human trial in the databases we searched, though unpublished or non-English work may exist.
You may see lab papers cited as spicules beating a Dermaroller. Do not read them that way. The 2020 study used a 0.2 mm roller on pig skin, far from professional depth, and measured tracer delivery rather than skin improvement. Authors holding patents ran these comparisons.
What is known about spicule safety
Only short-term tolerability. In Ha 2017, six of 20 people had redness and prickling that cleared within minutes. In a 2026 University of Tokyo Hospital study of a microneedle-containing cream, published in the Journal of Cosmetic Dermatology, two of 21 withdrew with itching and irritation. The 2025 study reported no skin reactions, while noting that "Only short-term tolerability was assessed".
The conference abstract mentioned earlier, which analysed 272 TikTok videos, found tingling or stinging in 23.7%, "often framed as desirable". But 70.2% of the videos involved commercial relationships and reaction status was unclear in 66.5%, so this is not a safety finding.
We did not find data on long-term use, repeated silica exposure, darker skin types, or pregnancy and breastfeeding. Nor did we find a published case series of cosmetic spicule injury. Missing data is not evidence of harm, or of safety. A letter raising concern about silica spicules has appeared in a dermatology journal; we could not read its full text, so we do not report its argument.
Who should avoid them is clinician opinion, not trial data. Dermatologists in commission-earning coverage commonly advise against spicules with rosacea, eczema, active acne or a damaged barrier, and urge caution alongside retinoids or acne medication, after procedures, and on open or infected skin. If a skin problem could be medical, see your GP first.
What UK rules say
Under UK rules, cosmetics claims need adequate and verifiable evidence and must not imply characteristics or functions a product does not have. That same MHRA guidance treats products claiming to treat, prevent or fight spots and acne as medicines.
On 13 May 2026 the ASA ruled against 111 Skin. The challenged claims included one about a microspicule delivery system helping ingredients absorb. The penetration test had one subject and was done on the arm, and the 30-person clinical study had no placebo or control group. That ruling concerned one advertiser's evidence. It is not a ban on spicules, and we found no rule that addresses the phrase "microneedling in a bottle" directly.
Microneedling deserves the same scrutiny
Plain mechanical microneedling is not a miracle either. (RF microneedling is a different treatment, and nothing here applies to it.)
Its best evidence is for acne scars, where a meta-analysis of 12 randomised trials and 414 patients found a mean difference of 0.42: significant, but modest. For wrinkles, the SkinPen trial reported 81.3% improved on a clinician's global score at 3 months among 32 people who completed it, but three authors worked for the manufacturer. The 48-person Exceed trial found no clinically meaningful improvement in forehead lines, nasolabial folds or upper lip lines, even though other areas improved. The literature is mostly small, single-centre and short, and durability beyond about 6 months is essentially unstudied.
It also carries real risks:
- Expected: everyone in the Exceed trial had immediate redness and peeling from days 3 to 8. So "no downtime" is not an honest description.
- Pigment change and scarring: pooled data put post-inflammatory hyperpigmentation at 6.8% and tram-track scarring at 10.5% with rollers. Darker skin types carry a higher pigmentation risk.
- Reactions and infection: rare granulomatous reactions have been linked to vitamin C serum used around treatment, because most cosmetic topicals are not made or licensed for use within the skin. In the Exceed trial, 8 of the 13 people predisposed to cold sores had an outbreak.
- Not suitable: BCAM lists pregnancy and breastfeeding, keloid history, anticoagulant therapy and active skin infection as reasons not to have it.
So which, if either?
A spicule serum may be reasonable if you see it as a cosmetic, tolerate it and accept thin evidence. Buy it as skincare, not as a stand-in for a procedure.
If your goal is acne scarring or lines, the human evidence is stronger for microneedling than for spicules, though the benefit is modest, wrinkle results vary by area, and the risks above apply. It also costs far more, and both wrinkle trials used four sessions. Weighing that up and choosing neither is a perfectly sensible outcome.
VIVO Body Studio offers microneedling. If you would like a second opinion, we can give you an honest assessment at one of our clinics of whether it suits your skin and your goal, including when the answer is no. No result is promised. If you are also considering energy-based options, our HIFU vs microneedling comparison may help.
Pros
- Used at home with no appointment, and a bottle reportedly costs far less than one clinic microneedling session.
- Laboratory and animal studies consistently suggest spicules can increase the delivery of ingredients, so the idea behind them is plausible.
- Reported reactions in small, short human studies were mostly mild and brief, such as redness and prickling that settled within minutes, although two people in one study withdrew.
Cons
- We found no human trial comparing spicules with microneedling, and no human biopsy study showing that spicules build new collagen.
- The human studies are small and short, many have commercial links, and 'spicule' covers different materials, so one result does not transfer to every product.
- We found no data on long-term use, darker skin types, or pregnancy and breastfeeding.
Frequently Asked Questions
Are spicules the same as microneedling?
No. Spicules are tiny particles in a cosmetic rubbed on at home, while microneedling is a clinic procedure using a sterile needle device. The channels spicules make appear far shallower, and we found no human trial comparing the two.
Do spicule serums build collagen?
We found no human biopsy study showing that they do. Collagen statements in trend coverage are clinician opinion rather than trial data. The strongest human study used ultrasound and included a growth factor, so it cannot show that spicules alone stimulate collagen.
Who should avoid spicule skincare?
Dermatologists quoted in commission-earning shopping features advise against it for people with rosacea, eczema, active acne or a damaged skin barrier. That is clinician opinion, as no trial has tested it. We also found no data for pregnancy or breastfeeding, so ask your GP or midwife if this applies to you.
Can a spicule serum treat acne?
The MHRA treats products that claim to treat, prevent or fight spots and acne as medicines, so a cosmetic should not be making that claim. The evidence for spicules in acne is not strong enough to rely on. If acne is troubling you, speak to your GP or a pharmacist.
Can I use a spicule product straight after microneedling?
Clinician commentary urges caution with spicule products after procedures and on open skin. No trial has tested this, so ask your practitioner what to use, and when, before going back to your normal routine.
