Is Spicule Skincare Safe? What the Studies Show
Is spicule skincare safe? Sponge spicules poke shallow, temporary channels in skin. Studies show mild, short-lived irritation, but human data are small.
Spicule skincare appears low-risk for healthy, non-irritated skin when used at the frequency on the label. Spicules are microscopic silica needles from sponges that make shallow, temporary channels in the outer skin layer. Animal tests found only slight, short-lived irritation, and two small human trials with full published methods (41 women in total) reported no adverse reactions.
That answer comes with a size warning. Most of the data come from one Chinese research group working on pig, mouse and guinea pig skin, and the human trials tested clinic or company formulas, not the serums on store shelves.
What is a spicule serum?
A spicule serum is a cosmetic that contains spicules, the needle-shaped silica fragments that form the skeleton of sponges. Brands grind and purify them so they can be suspended in a serum, essence or cream. Marketing names include “micro-needle shot”, “reedle”, “skin needle” and “spicule booster”.
The sponge source varies. Most published lab work uses spicules from the marine sponge Haliclona sp., which researchers at Xiamen University describe as “silicious oxeas which are sharp-edged and rod-shaped (∼120 μm in length and ∼7 μm in diameter)” (Zhang S et al., 2017, Molecular Pharmaceutics). A 2026 Korean clinic trial instead used spicules isolated from the freshwater sponge Spongilla fragilis (Noh et al., 2026, Journal of Cosmetic Dermatology). Different sponges give different needle shapes and sizes, so results from one source do not automatically transfer to another.
How do you find spicules on an ingredient list?
On labels, spicules usually appear as hydrolyzed sponge, and some US listings print silica in the same spot. INCI is the standardized ingredient-naming system used on cosmetic labels. VT Reedle Shot 300 is a useful decoding example, because two retailers publish its list with one difference.
| Position | EU retailer list (Boozyshop) | US retailer list (Vitacost) | What it tells you |
|---|---|---|---|
| 8 | Ethylhexyl Palmitate | Ethylhexyl palmitate | Same formula, same order |
| 9 | Hydrolyzed Sponge | Silica | The spicule ingredient, named by source in one list and by chemistry in the other |
| 10 | Sodium Acrylate/Sodium Acryloyldimethyltaurate Copolymer | Sodium acrylate/sodium acryloyldimethyl taurate copolymer | Thickener that keeps spicules suspended |
| Mid-list | Centella asiatica extract, sodium hyaluronate | Centella asiatica extract, sodium hyaluronate | The “Cica” and “Hyalon” in VT’s Cicahyalon name |
Both lists were checked on October 7, 2026 (Boozyshop, Vitacost). The practical rule: if a product promises a “needle” or “shot” effect and lists either hydrolyzed sponge or silica near the top third, it is a spicule product. Silica alone is also a common oil-absorbing powder, so check the marketing claim before assuming.
How do spicules create microchannels?
Spicules pierce the stratum corneum, the dead outer layer of skin, and the holes they leave let water-loving ingredients pass through for a few days. The stratum corneum normally blocks large molecules such as hyaluronic acid. The needles act like thousands of tiny splinters rather than a single wound.
The key numbers come from the Xiamen University group:
- Channel density and depth: in a 2019 study, spicule treatment produced 850 ± 125 micro-channels per mm², 48.6 ± 13.5 µm deep, that “gradually closed up in 120 h” (Zhang C et al., 2019, Biomaterials Science). For scale, 49 µm is about half the thickness of a sheet of printer paper.
- How long they stay: spicules remained in skin “over at least 72 h” (Zhang S et al., 2017).
- Delivery boost: in pig skin, spicules increased penetration of a 10 kDa test molecule 33-fold versus untreated skin. In mice, absorption was 15-fold higher than with a Dermaroller microneedling tool (same 2017 study).
- Larger cargo: spicules raised skin absorption of stem-cell exosomes 5.87-fold in pig skin (Zhang K et al., 2020, International Journal of Nanomedicine).
That last point is why spicules are paired with buzzy actives such as PDRN and exosomes. If you are weighing a “PDRN Reedle Shot”, the companion question is whether the DNA ingredient itself has evidence, covered in our explainer on what PDRN is and how strong the topical data are.
Is spicule skincare safe for your skin?
For healthy skin, the published data point to mild, temporary irritation and no serious reactions, but the human evidence is small and short. These are the published studies with outcomes in people or live animals.
| Study | Who or what | Exposure and length | Comparator | Safety finding | Strength |
|---|---|---|---|---|---|
| Zhang S, 2017 | Guinea pigs, mice, pig skin | Haliclona spicules, single application | Untreated, saline, Dermaroller | Skin disruption “self-limited”, water loss recovered with time | Lab-only |
| Zhang C, 2019 | Mice, pig skin | Spicules plus flexible liposomes | Saline, spicules alone, Dermaroller | “Very minimal redness”, quick recovery | Lab-only |
| Zhang K, 2020 | Guinea pigs, mice | Spicules plus exosomes | Exosomes alone | “Slight irritation”, skin “recovered shortly” | Lab-only |
| Lee, 2025 | 21 healthy women aged 34-66 | Spicule-coated secretome formula, twice daily for 2 weeks | None (single arm) | No adverse skin reactions; patch tests scored by ICDRG criteria | Limited |
| Noh, 2026 | 20 Asian women aged 30-65 | Clinic-applied GHK peptide spicule regimen, 5 weekly sessions, follow-up to week 9 | Same regimen with or without a booster, split face | “No adverse reactions occurred” | Limited |
Sources: Lee et al., 2025, International Journal of Molecular Sciences; Noh et al., 2026. Three authors of the Lee trial are affiliated with S&E bio, the company behind the formula, and the trial had no control group. The Noh trial was applied by trained operators in clinics, not at home.
The 2017 authors summed up the animal irritation work this way: “skin disruption induced by SHS treatment is self-limited and can be recovered with time and efficiently.” The 2025 Korean trial authors were more cautious about the human side, writing that their findings “should be interpreted as preliminary and hypothesis-generating rather than definitive evidence” and calling for “longer-term cosmetovigilance and rare-event surveillance.”
Why does a spicule serum tingle?
The tingling is mechanical: the needles are physically sitting in the outer layer of skin. Because spicules stay in place for at least 72 hours in animal tests, pressing your face, washing or applying the next product can set off a fresh prickle a day or two later.
Use this as a quick sensation check:
| What you feel | Likely cause | What to do |
|---|---|---|
| Light prickle that fades within minutes | Spicules lodging in the outer layer | Normal; continue at the labeled frequency |
| Prickle when touching skin the next day | Spicules still embedded | Normal for up to about 3 days; avoid scrubbing |
| Stinging when the next product goes on | Open channels letting acids, fragrance or alcohol in | Use a plain moisturizer after spicules; move actives to another night |
| Redness or burning lasting more than a day | Too high a grade, too often, or a barrier already irritated | Stop, return to a basic routine, restart at a lower grade or not at all |
| Small bumps or flaking | Irritation, not “purging” | Stop and let skin settle |
Spicule bumps are not purging. Purging is a temporary acne flare from ingredients that speed up skin turnover, and the difference matters for deciding whether to push through; our guide to whether niacinamide causes purging walks through how to tell the two apart. Reedle Shot also contains niacinamide high on its list, which is a separate possible source of flushing for some people.
What is the difference between Reedle Shot 100, 300 and 700?
VT calls the number a hardness level, and each step up also lists more particles and a less frequent schedule. The number is often described online as the spicule count, but the US listings print it as “Hardness” and give the particle count separately.
| Product (US listing) | Label “hardness” | Stated particles | Labeled use | Size | Vitacost price, Oct 7, 2026 |
|---|---|---|---|---|---|
| Reedle Shot 100 | 100 | 95,000 | First step of daily care | 50 mL | $29.18 |
| Reedle Shot 300 | 300 | 237,500 | First step, every 3 days | 50 mL | $39.22 |
| Reedle Shot 700 | 700 | 570,000 | Night care, every 7 days | 30 mL | $36.19 |
A little math shows why the grades feel so different. The 300 lists 2.5 times the particles of the 100, and the 700 lists 6 times. The listings do not say whether the count is per bottle or per dose. If it is per bottle, the 700 packs about 19,000 particles per mL against about 1,900 per mL for the 100, a tenfold difference in a smaller bottle. Either way, start with the 100.
Why is spicule skincare so popular in Korea?
Reedle Shot turned a niche lab material into a mass-market Korean category. VT Cosmetic said in November 2023 that cumulative Reedle Shot sales had passed 1 million units (The Fair News, November 2023). In the first half of 2025, parent company VT reported revenue of 185.1 billion won, up 38.3% year on year, and operating profit of 52.8 billion won, with Reedle Shot named as the driver (Herald Economy, August 2025).
The appeal fits how Koreans layer products: a thin “booster” step right after cleansing so the serums that follow absorb better. If you want to see where a booster sits in a real routine, and which steps most Koreans actually skip, see what Koreans actually do in their skincare routine.
How does spicule skincare compare with microneedling and chemical exfoliants?
Spicules sit between chemical exfoliants and microneedling: they physically pierce the outer layer like needles, but only shallowly and as a cosmetic. The FDA defines microneedling devices as “instruments with technological features, such as many small needles, tips, or pins on the surface, which are repeatedly inserted and removed into the skin,” and regulates them as medical devices when they penetrate living skin layers (FDA, Microneedling Devices, content current as of October 15, 2025).
| Feature | Spicule serum | Microneedling (device) | Chemical exfoliant (AHA, BHA, PHA) |
|---|---|---|---|
| How it works | Silica needles lodge in the outer layer and open temporary channels | Metal needles repeatedly inserted into skin | Acids loosen the bonds between dead surface cells |
| Depth shown in studies | About 49 µm channels in pig skin | Reaches living skin layers, per FDA’s device definition | Surface layers |
| How long the effect lasts | Channels closed over about 120 hours in pig skin | Varies by device and needle length | Hours to days of increased sensitivity |
| US status | Sold as a cosmetic | Medical device when it penetrates living skin | Cosmetic; salicylic acid acne products are OTC drugs |
| Human evidence | Two small trials, 41 women total | Large body of clinical literature | Decades of use and trials |
| Common side effects | Prickling, redness | Dryness, redness, itching, peeling, bruising, bleeding (FDA list) | Stinging, dryness, sun sensitivity |
| Risk when combined | High: open channels let other actives in deeper | Clinic protocols control what goes on after | High with retinoids or other acids |
Mixing categories on the same night is where most trouble starts. A spicule serum followed by a glycolic acid toner or a retinoid gives a strong ingredient a faster way in.
Who should skip spicule products?
Skip spicules if your skin is broken, sunburned, actively inflamed or already stinging from another product. Use this checklist before buying:
- Skip on cuts, open blemishes, sunburn, active eczema patches or a flare of rosacea; channels on top of an inflamed barrier add irritation.
- Skip within the recovery window after an in-office peel, laser or microneedling session.
- Do not combine on the same night with AHAs, BHAs, retinoids or high-strength vitamin C.
- Avoid the eye area and lips unless the product is made for them.
- Start low: patch test on the jawline for 2-3 days, then begin with the lowest grade at the labeled frequency.
- Wear sunscreen daily while using spicules, since the outer layer is temporarily disrupted.
If redness, swelling or bumps persist for more than a few days after stopping, see a board-certified dermatologist.
What is known and what is still unknown?
Known: sponge spicules physically disrupt the outer skin layer, stay in for roughly 3 days, open channels that close in about 5 days in pig skin, and raised delivery of test molecules 6- to 33-fold in pig-skin lab studies. Animal irritation tests and two small human trials found mild or no reactions.
Unknown: what happens with years of repeated use, how sensitive, darker or rosacea-prone skin responds, and whether the spicule grades in store products match those tested in labs. A Chinese acne study reported that a 1% spicule gel cut lesion counts by 51.4% after 14 days; participant numbers were not reported in the abstract (He et al., 2025, Drug Delivery and Translational Research). As of October 7, 2026, PubMed lists no published study of spicule lip plumpers.
The evidence fits a simple rule: spicules are a delivery trick with a short, mild irritation profile on healthy skin, and the safest way to use them is the lowest grade, the labeled schedule and nothing harsh layered on top.
Sources and research notes
Five peer-reviewed sponge-spicule studies (2017, 2019 and 2020 animal and pig-skin delivery and irritation work, a 2025 single-arm trial of 21 women, a 2026 split-face clinic trial of 20 women) plus a 2025 acne study abstract, the FDA microneedling device page, VT Reedle Shot 100, 300 and 700 US retail listings with hardness, particle counts, directions and INCI, an EU retail INCI list, and two Korean news reports on Reedle Shot sales, checked on the date shown.
Source record date: 2026-10-07. Prices and availability are as of that date.
- Zhang S et al. 2017, Mol Pharm: Skin delivery of hydrophilic biomacromolecules using marine sponge spicules (Haliclona sp., 120 µm, retained 72 h, guinea pig irritation)
- Zhang C et al. 2019, Biomater Sci: sponge spicules plus flexible liposomes (850 channels/mm2, 48.6 µm deep, closed in 120 h)
- Zhang K et al. 2020, Int J Nanomedicine: exosomes with sponge spicules (5.87-fold delivery, slight irritation in guinea pigs)
- Lee NE et al. 2025, Int J Mol Sci: nano-encapsulated spicule system, single-arm trial of 21 women for 2 weeks, no adverse reactions
- Noh S et al. 2026, J Cosmet Dermatol: split-face GHK spicule regimen trial, 20 women, 5 weekly sessions, no adverse reactions
- He W et al. 2025, Drug Deliv Transl Res: sponge spicules with Sph12-38 in rabbit ears, 1% spicule gel clinical lesion reduction 51.4% at 14 days (abstract)
- FDA: Microneedling Devices (definition, device status, risks; content current as of 2025-10-15)
- Vitacost: VT Reedle Shot 100 50 mL listing (hardness 100, 95,000 Cica Reedle, daily use, INCI, US$29.18 on 2026-10-07)
- Vitacost: VT Reedle Shot 300 50 mL listing (hardness 300, 237,500 Cica Reedle, every 3 days, INCI with silica, US$39.22 on 2026-10-07)
- Vitacost: VT Reedle Shot 700 30 mL listing (hardness 700, 570,000 Cica Reedle, every 7 days at night, US$36.19 on 2026-10-07)
- Boozyshop: VT Reedle Shot 300 INCI listing Hydrolyzed Sponge
- The Fair News, 2023-11-13: VT Reedle Shot cumulative sales pass 1 million units
- Herald Economy, 2025-08-12: VT H1 2025 revenue 185.1 billion won (+38.3%), operating profit 52.8 billion won, led by Reedle Shot
Frequently asked questions
What is a spicule serum?
A spicule serum is a skincare product that contains spicules, the microscopic glass-like silica needles that make up the skeleton of sea and freshwater sponges. When massaged in, they lodge in the outer layer of skin and open temporary channels that let other ingredients in more easily.
Why does spicule skincare tingle or prickle?
The prickle is the spicules themselves: rod-shaped silica fragments about 120 µm long sitting in the outer skin layer. In animal studies they stayed in skin for at least 72 hours, so a mild prickle when you touch your face the next day is expected. Burning, swelling or redness that lasts past a day is a reason to stop.
What is the difference between Reedle Shot 100 and 300?
VT labels the number as a hardness level. US listings checked on October 7, 2026 state 95,000 Cica Reedle particles for the 100 and 237,500 for the 300, with the 100 for daily use and the 300 every 3 days. The 700 lists 570,000 particles and once-every-7-days night use.
Can I use a spicule serum every day?
Only the gentlest grades are labeled for daily use. VT directs Reedle Shot 100 for daily use, 300 every 3 days and 700 once a week at night. Higher grades used more often than labeled add irritation without any study showing extra benefit.
Are spicule lip plumpers safe?
They work by mild irritation, which is what makes lips look fuller for a short time. A PubMed search on October 7, 2026 found no published study of spicule lip products, so their safety rests on the face data. Skip them on chapped, cracked or cold-sore-prone lips.
Is spicule skincare the same as microneedling?
No. Microneedling devices push needles into living skin and are regulated by the FDA as medical devices when they do. Spicule creams are sold as cosmetics; in pig-skin tests the channels they made were about 49 µm deep and closed within about 5 days.