Are Spicules Safe for Skin? Here's What You Should Know

If spicules are like tiny needles, can they really be safe for your skin? Fair question! Technically speaking, a spicule is a pointed, sharp structure. But the pokey shape is ultra-fine and teensy-tiny, so it's not as scary as it sounds.

Still, it's understandable to be hesitant, especially if you have an easily irritated complexion or have skimmed Reddit forums for anecdotal accounts of reactions to products containing this skincare ingredient. However, not all spicules are created equally. If you go with a quality formula and carefully incorporate it into your skincare routine, you might be surprised at how well your skin looks and feel.

Our guide will explain:

• What spicules are in skincare and what they do
• If they are safe for all skin types
• How Rael uses spicules in its products
• How to apply our products properly to minimize the chances of irritation

What Are Spicules in Skincare?

So, what are spicules? They are microscopic, needle-shaped structures.¹ The spicules used in skincare typically come from sea sponges or coral, consisting of the calcium or silica found naturally in these organisms. Rael uses the sponge variety for our facial serums. We'll explain why in a moment.

How Do Spicules Work?

Spicules aren't considered an active ingredient. It's what they do for other ingredients that's important. When applied to the skin, spicules create tiny channels (called microchannels or nano-channels) in the epidermis, the outermost layer of skin. This helps support the movement of ingredients into the upper skin layer.²

Skincare products containing spicules can gently exfoliate and improve product absorption by up to 342%*. The result? The look of smoother skin and a reduction in the appearance of fine lines over time. A spicule-infused night serum provides a gentle at-home solution that supports your skin’s journey.

*Based on 42 participants, ages 20-59 in a 4 week clinical study.

Are Spicules Safe for All Skin Types?

It depends on the formula, concentration of spicules, and other ingredients within a product. But generally speaking, yes, spicules can be safe for most skin types when used correctly.³

Be mindful of the formula, though. Rael's Microcrystal Serums, for instance, are dermatologist-reviewed and clinically tested to be safe for sensitive skin.

Of course, everyone's skin is different. One person's "sensitive skin" could tolerate a product just fine, while another person with "sensitive skin" may experience an adverse reaction. When in doubt, check with a dermatologist or do a patch test before applying anything to your face.

Sponge-Derived Spicules

The type of spicule used in a skincare product is crucial. Rael's serums call on sustainably harvested spicules sourced from hydrolyzed freshwater sponges. Carefully refined to retain their natural structure, the preserved needle-like shape interacts with the skin surface on a microscopic level.⁴

These night serums are made with spicules in controlled particle sizes (spicule length) and concentrations. Our clean formulas are more eco-friendly than products containing synthetic microbeads, gentler than many scrubs (like those with scratchy apricot pit particles), and totally free of actual metal needles. They're not only safe but also highly supportive of your skincare goals.⁵

Topical Spicule Application vs. Physical Tools

If you’re intrigued by spicule skincare, but hesitant about the potential risks of more invasive options, a topical spicule serum could be just what your routine needs.

Without any real needles and with virtually no downtime, spicule-based formulas can support skin ingredients like peptides, cica PDRN, and azealic acid. The result is brighter, smoother-looking complexion.

You might feel mild tingling or slight roughness for 12 to 24 hours after applying the night serum, but there's minimal risk of disrupting the skin's moisture barrier.⁶

What If You Have Blemish-Prone or Sensitive Skin?

You may not be able to predict exactly how your skin will respond to a new product. But sponge-derived spicules can aid in ingredient absorption without exacerbating issues. 

In fact, the right formulation can be well-tolerated by sensitive skin while helping support a balanced complexion over time.^7,8

Rael's Story and Approach to Spicule Skincare

Rael started with menstrual care products and then expanded its horizons to holistic self-care solutions, including blemished skin products.

Our spicule skincare products are inspired by traditional cosmetic products, powered by innovative K-beauty technology, and formulated to support real skin concerns.

Formulation Highlights

Here's a rundown of the key ingredients in our spicule serums:

• Microcrystal spicule technology: The microscopic crystal-like spicules gently open up microchannels in the skin for any topicals you apply afterward.⁹
• Azelaic acid: The spicules are coated in azelaic acid, another scary-sounding but actually skin-friendly ingredient that helps reduce the look of redness. It can also help skin look clearer over time by acting as a mild exfoliant.¹⁰
• Cica PDRN: Cica PDRN is a combination of centella asiatica and polydeoxyribonucleotide that reduces the appearance of redness and helps skin look smoother and healthier.^11,12
• Allantoin: This plant compound works to reduce the appearance of redness and irritation, keeping sensitive skin looking balanced.¹³
• Ectoin: Ectoin is a protective molecule that helps protect the skin from common environmental stressors like sun damage and air pollution.¹⁴

When choosing a Rael spicule product, you have two formats: spot patches and full-face serums. The Microcrystal Spot Cover patch delivers spicules through a hydrocolloid patch designed for early-stage emerging blemishes (matches Rael's PDP language). The Microcrystal Activated PM Serum 2000 (Allantoin and Ectoin) and PM Serum 5000 (Cica PDRN and Copper Peptide) apply spicules across the full face during overnight wear. The graduated tier system swaps the entire supporting active stack at each strength.

How to Use Rael's Microcrystal 2000 and 5000 Safely

With a spicule serum, the most important things are following the brand's instructions and not using it too often (or too much of it). So, what serum should you use? Exactly what and how to use the formula depends on the concentration.

Microcrystal 2000

Our Microcrystal 2000 formula is best for beginners, sensitive complexions, and reactive skin types. It has a milder concentration of spicules, and each spicule is shorter in length, so they're less likely to aggravate the skin. You can use this product all over your face, neck, and décolletage, or treat smaller problem areas, like the T-zone, chin, or cheeks.

We recommend using it at night after washing your face. Apply the serum to clean, dry skin. Once it's absorbed, you can follow with another serum (like a reparative or hydrating formula). But you may not want to use anything containing retinol, vitamin C, or a chemical exfoliant (AHAs and BHAs) on the same night to avoid irritation. Finish with a fragrance-free, barrier-repairing moisturizer.

Start with just two or three nights a week. You can gradually work your way up to nightly use or stick with just a few weekly applications.

Microcrystal 5000

Microcrystal 5000 has a higher concentration of spicules, but still at a controlled length that reaches deep into the skin with minimal irritation. This product is for experienced spicule users and those who've tolerated the 2000 formula well. It's ideal for full-face resurfacing or targeting larger areas with blemish scars or uneven texture.

Apply this serum in the evening after cleansing. Gently pat it into dry skin with clean hands—no need to rub. Start with just once a week or even every 10 days, depending on how your skin tolerates it. Then you can gradually increase to two or three uses a week.

You might notice a prickling sensation just after applying Microcrystal 5000. This is normal and temporary. You may also experience a slightly rough texture and light flaking for up to 48 hours. Then, get ready for smoother, clearer, brighter-looking skin to emerge.

How to Safely Use Spicule Products in Your Skincare Routine

Here are a few more best practices for incorporating spicule products into your skincare routine.

Nighttime Routine

As mentioned, we recommend applying spicule serums at night. That way, your skin has several hours to acclimate to the product before being exposed to sunlight.

After cleansing, pat your skin dry with a clean cloth. Only apply spicule serum to clean, dry skin. Use just a small amount—one to two pumps, max. Then follow with a moisturizer or barrier cream to lock in hydration.

And don't use it every night. You can slowly bump it up over time, but two or three days a week is plenty for most people.

Morning Routine (Following Nighttime Application)

The morning after applying spicule serum, rinse your face with lukewarm water or use a gentle cleanser. Apply a calming serum and moisturizer with ingredients like cica, ceramides, aloe vera, or hyaluronic acid.

Then slather on a broad-spectrum sunscreen (at least SPF 30), even if you have no plans to spend time outdoors. Ideally, you'll also avoid direct sun exposure for two days, so grab a hat or seek shade if needed.

Spicules Can Be Safe and Effective with the Right Formula

Are spicules safe for skin? Yes, they absolutely can be, as long as they're carefully formulated with gentle sponge spicules and other ingredients that are suitable for sensitive and blemish-prone skin.

With Rael, you can count on skincare products that are balanced with clean, vegan formulations and ingredients to support a healthier-looking complexion. Our formulations are clinically tested to be safe for sensitive skin.

FAQ

Are spicules the same as microneedling? Is it safe?

Spicules and microneedling are different formats. Microneedling uses physical needles (in-office) or a derma roller (at-home tool). Spicule skincare uses microscopic sea-sponge particles in a serum or patch, applied topically, that dissolve over wear. Rael's Microcrystal serums are clinically tested to be safe for sensitive skin.

What is liquid microneedling and is it safe to do at home?

Liquid microneedling is the K-beauty term for spicule-based serums, a topical format applied as a serum, not a tool. It's safe to do at home when you follow product instructions: apply at night, start with 2 to 3 nights per week, use one to two pumps max, and follow with a moisturizer. Rael's Microcrystal 2000 is designed as the introductory formula; Microcrystal 5000 is for users who have tolerated 2000.

Do spicules cause stinging or redness?

A mild tingling sensation for 12 to 24 hours after application is normal. Sustained redness, burning, or peeling means the dose is too high for your skin: scale back to once a week and use the Microcrystal 2000 formula instead of the 5000. Always patch test before full-face application.

Can I use spicule products on sensitive skin?

Yes, with the right formula. Rael's Microcrystal serums are dermatologist-reviewed and clinically tested safe for sensitive skin. Avoid layering with retinol, vitamin C, or chemical exfoliants on the same night. Always follow with a barrier-repairing moisturizer.

How long do spicules stay in my skin?

The spicules dissolve in the upper skin layer over the course of overnight wear (serums) or 4 to 8 hours (patches). The structures gradually break down during wear. They are not permanent.

Spicule patch vs spicule serum: which is safer to start with?

The patch (Rael Microcrystal Spot Cover) is often the easiest starting format because spicules are confined to a single spot and a fixed time window. Move to a serum (Microcrystal 2000 first, then 5000) once you have tolerated the patch and want all-face benefits.

Sources: 

1. Merriam-Webster. "Spicule." https://www.merriam-webster.com/dictionary/spicule. Accessed on Aug. 20, 2025.
2. Kim TG, et al. "A novel dermal delivery system using natural spicules for cosmetics and therapeutics." Journal of Cosmetic Dermatology, 21 Oct. 2022, https://pubmed.ncbi.nlm.nih.gov/35034416/. Accessed on August 18, 2025.
3. Han DH, et al. "Subjective Skin Improvement and Safety of the Spicules-containing Cosmetics." Journal of Convergence for Information Technology, 28 Aug. 2021, https://koreascience.or.kr/article/JAKO202124458091064.page. Accessed on August 18, 2025.
4. Zhang S, et al. "Skin Delivery of Hydrophilic Biomacromolecules Using Marine Sponge Spicules." Molecular Pharmaceutics, 1 Aug. 2017, https://pubs.acs.org/doi/abs/10.1021/acs.molpharmaceut.7b00468. Accessed on August 18, 2025.
   
5. Zhang C, et al. "Enhanced Skin Delivery of Therapeutic Peptides Using Spicule-Based Topical Delivery Systems." Pharmaceutics, 8 Dec. 2021, https://www.mdpi.com/1999-4923/13/12/2119. Accessed on August 18, 2025.
6. Liang X, et al. "Skin Delivery of siRNA Using Sponge Spicules in Combination with Cationic Flexible Liposomes." Molecular Therapy Nucleic Acids, 5 Jun. 2020, https://www.sciencedirect.com/science/article/pii/S2162253120301116. Accessed on August 18, 2025.
7. Sauer N, et al. "The multiple uses of azelaic acid in dermatology: mechanism of action, preparations, and potential therapeutic applications." Advances in Dermatology and Allergology, 8 Jan. 2024, https://pmc.ncbi.nlm.nih.gov/articles/PMC10809820/. Accessed on August 18, 2025.
8. Sherban A, et al. "Role of Cica (Centella asiatica) in Skincare Formulations: Examination of a Popular Ingredient." SKINmed, 30 Apr. 2022, https://pubmed.ncbi.nlm.nih.gov/35532760/. Accessed on August 18, 2025.
9. Squadrito F, et al. "Pharmacological Activity and Clinical Use of PDRN." Frontiers in Pharmacology, 26 Apr. 2017, https://pmc.ncbi.nlm.nih.gov/articles/PMC5405115/. Accessed on August 18, 2025.
10. Talakoub L, et al. "Allantoin." Cosmetic Dermatology, 2009, https://www.sciencedirect.com/topics/medicine-and-dentistry/allantoin. Accessed on August 18, 2025.
11. Xu D, et al. "Ectoin attenuates cortisone‐induced skin issues by suppression GR signaling and the UVB‐induced overexpression of 11β‐HSD1." Journal of Cosmetic Dermatology, 2 Sep. 2024, https://pmc.ncbi.nlm.nih.gov/articles/PMC11626367/. Accessed on August 18, 2025.
12. Oxford Dictionary of Biochemistry and Molecular Biology. "Spicule." https://www.oxfordreference.com/display/10.1093/oi/authority.20110803100523457. Accessed on Aug. 20, 2025.
13. Ha JM, et al. "The Effect of Micro-Spicule Containing Epidermal Growth Factor on Periocular Wrinkles." Annals of Dermatology, 24 Mar. 2017, https://pmc.ncbi.nlm.nih.gov/articles/PMC5383744/. Accessed on August 18, 2025.
    
14. Jaiswal S, et al. "Microneedling in Dermatology: A Comprehensive Review of Applications, Techniques, and Outcomes." Cureus, 23 Sep. 2024, https://pmc.ncbi.nlm.nih.gov/articles/PMC11499218/. Accessed on August 18, 2025.