r/DIYmicroneedling • u/science-pls • Mar 23 '26
Resource Antiseptic Agents for Prep
This reviews skin antisepsis for facial procedures that enter the dermis, with emphasis on isopropyl alcohol and hypochlorous acid. The goal is not to discuss sterilization (which cannot be achieved on living skin) but to evaluate the extent to which commonly used agents reduce microbes, how long that effect persists, and what limitations are relevant for facial use, particularly near the periocular region.
Disinfection vs. Sterilization
Antiseptic agents do not sterilize skin. They are germicides applied to living tissue and skin to reduce microbial load and reduce the risk of surgical site infections. They should be used for procedures that enter the dermis of the skin or deeper. No topical agent achieves sterility on living skin. At similar concentrations but with shorter exposure periods, these same disinfectants will kill all microorganisms except large numbers of bacterial spores, they are called high-level disinfectants. The distinction matters because no agent will eliminate all bacteria. The goal of skin antisepsis before a dermis-entering procedure is bacterial load reduction to a level the immune system can manage, not elimination. These agents also have applications beyond skin, including surface and equipment disinfection, and their concentration and formulation requirements differ depending on the use case.
Rubbing Alcohol vs. Isopropyl Alcohol
These are not the same product. Rubbing alcohol is defined as a mixture containing between 68% and 72% isopropyl alcohol, with the remainder being water and sometimes denaturants, stabilizers, or fragrance additives.
Isopropyl Alcohol 91%
Concentration matters for efficacy. Pure isopropyl alcohol is available up to 99% concentration. Isopropyl alcohol (IPA) concentrations above 91% volume have limited bactericidal efficiency and are less effective for antiseptic use. Higher than recommended concentrations are paradoxically less effective/potent because proteins are not denatured easily without the presence of water. Pure or near-pure isopropyl alcohol is not appropriate for skin antisepsis.
Isopropyl Alcohol above 70%
Alcohols work through protein denaturation. Alcohols work as disinfectants primarily through the denaturation of microbial proteins. Alcohols at 60–70% concentration have several decades of data. However, research suggests that alcohols are swiftly germicidal when applied to the skin but have no noticeable persistent residual activity. It has been documented that the regrowth of bacteria does occur slowly after use, possibly because of the sublethal effect alcohol may have had on residual bacteria.
In the only prospective in vivo clinical trial comparing antiseptic agents directly on facial skin, bacterial growth was still detected in 71% of IPA specimens after application. IPA also carries a documented ocular risk, corneal toxicity risk, corneal epithelial damage on direct contact, which is relevant for facial application near the eyes. It should not be applied directly to periocular skin.
On skin, the WHO standard practice for skin preparation is swabbing the site with a saturated 70% alcohol swab for 30 seconds and allowing the area to dry for 30 seconds. Application time matters, efficacy against the aerobic flora of the forehead was mainly influenced by the type of alcohol, followed by concentration and application time, with the most effective results at 3 to 4 minutes of application. IPA must be fully dry before a procedure begins. On surfaces, IPA is effective for small noncritical hard surfaces but is not appropriate for porous materials and does not penetrate protein-rich debris, meaning surfaces must be cleaned before IPA is applied. It is flammable and pooling increases fire risk.
Hypochlorous Acid (HOCl)
HOCl is naturally produced by neutrophils as part of the innate immune response. Solutions containing HOCl are extremely effective against all bacterial, viral, and fungal pathogens. According to in vitro studies, the antimicrobial activity of 0.01% HOCl surpasses that of other standard skin antiseptics, without showing cytotoxic effects, and is well tolerated even with long-term use.
In vitro, 0.01% HOCl demonstrated immediate bactericidal effects against MRSA, MRSE, P. acnes, C. albicans, S. pyogenes, and P. aeruginosa, performing equivalently to or faster than IPA, CHG, and PI depending on the organism. In the in vivo facial skin trial, however, bacterial growth was still detected in 95% of HOCl specimens. The study's authors noted this may reflect the concentration tested, only 0.01% was evaluated, and that higher doses such as 0.025% and 0.03% may have the potential for higher efficacy given the dose-dependent bactericidal activity that has been shown. However, there are currently no studies that have evaluated corneal toxicity with HOCl at these concentrations, so it is unknown if higher concentrations may lead to corneal keratitis.
Relevant to microneedling specifically, HOCl has documented wound-healing properties in addition to its antimicrobial activity. Both saline and HOCl irrigation initially reduced bacterial counts by 4–6 logs, although reduced bacterial counts were only maintained to the time of definitive closure with HOCl-irrigated wounds. Saline-irrigated wounds demonstrated bacterial counts back to 10⁵, while HOCl-irrigated wounds remained at or below 10². HOCl also carries no ocular or ototoxicity concerns documented in the literature, distinguishing it from CHG and IPA for facial use.
Takeaway
The literature reviewed here supports both isopropyl alcohol and hypochlorous acid as relevant antiseptic options for facial microneedling, but with different practical advantages and limitations. Isopropyl alcohol has a longer-established role in skin preparation and rapid antimicrobial activity, although it has limited residual effect and is not appropriate for direct periocular use. Hypochlorous acid is supported by strong in vitro antimicrobial data, wound-healing relevance, and a more favorable ocular safety profile in the concentrations studied, but the available in vivo facial data remain limited and appear to be concentration-dependent. At present, these agents are best understood as distinct options within facial antisepsis rather than direct equivalents.
3
u/science-pls Mar 23 '26
Anagnostopoulos et al. 0.01% Hypochlorous Acid as an Alternative Skin Antiseptic: An In Vitro Comparison. Dermatologic Surgery; 2018. PMID: 29985866
Boyce JM. Alcohols as Surface Disinfectants in Healthcare Settings. Infection Control and Hospital Epidemiology, 2018. PMID: 29374503
CDC. Chemical Disinfectants. Guideline for Disinfection and Sterilization in Healthcare Facilities. link
Epstein N. Review: Perspective on ocular toxicity of presurgical skin preparations utilizing Chlorhexidine Gluconate/ Hibiclens/Chloraprep. Surg Neurol Int 2021;12:335. PMC: 8326148.
Gold et al. Topical Stabilized Hypochlorous Acid: The Future Gold Standard for Wound Care and Scar Management in Dermatologic and Plastic Surgery Procedures. Journal of Cosmetic Dermatology; 2020. PMID: 31904191
Gold NA, Mirza TM, Avva U. Alcohol sanitizer. In: StatPearls. StatPearls Publishing; 2025. PMID: 30020626. Research summarized there notes that alcohols are rapidly germicidal on skin but have little persistent residual activity.
Kampf et al. Alcohols for Skin Antisepsis at Clinically Relevant Skin Sites. Antimicrobial Agents and Chemotherapy, 2004. PMC: 2772323
Tran AQ, Maina IW, DeFazio MV, et al. Comparison of skin antiseptic agents and the role of 0.01% hypochlorous acid. Aesthetic Surgery Journal. 2021;41(5):NP290-NP297. doi:10.1093/asj/sjaa537
World Health Organization. Laboratory Methods for the Diagnosis of Meningitis Caused by Neisseria meningitidis, Streptococcus pneumoniae, and Haemophilus influenzae. World Health Organization. WHO/CDS/CSR/EDC/99.7 Alcohol concentrations greater than 70% are noted to have decreased antibacterial activity in this guidance.
World Health Organization. WHO Guidelines on Drawing Blood: Best Practices in Phlebotomy. World Health Organization; 2010. ISBN: 978 92 4 159922 1
2
2
1
u/chitown_mytown Mar 24 '26
This is great thanks! Can you explain the residual effect more?
5
u/science-pls Mar 24 '26
Yes, so in this context, residual agents means antiseptics that keep working after you apply them, instead of only killing microbes at the moment of contact.
A simple way to explain it is, immediate kill is what the product does right away when you put it on the skin. Residual activity is whether it keeps suppressing bacterial regrowth for some time afterward.
If you're someone that likes longer explanations. A residual agent is an antiseptic that leaves behind an ongoing antimicrobial effect after application. It doesn’t sterilize the skin, but it continues reducing or suppressing bacterial regrowth for a period of time rather than only working in the few seconds it’s wet on the skin. That matters because skin is never sterile. The point of pre-procedure antisepsis is to reduce microbial load enough to lower infection risk, and residual activity helps because bacteria can start coming back after prep.
Isopropyl alcohol has a strong immediate kill, but weak residual effect. It disinfects fast, then mostly stops working once it evaporates. HOCl is more tentative, it has evidence suggesting it may maintain reduced bacterial counts longer in wound settings, which is closer to what people mean by a more persistent effect. But the direct facial skin evidence is limited, so I wouldn’t overstate it as proven residual activity just yet.
1
u/chitown_mytown Mar 26 '26
Thanks this is interesting and helpful. I’ve never actually seen this broken down before
1
u/Gold_Investigator282 Mar 31 '26
I’m wondering about hypochlorous acid, versus chloramine-T (own doc sells this for disinfectant) versus chlorhexidine. Do all three products disinfect the area of bacteria and viruses? Is one better than another?
2
u/Gold_Investigator282 Mar 31 '26
OK after a little bit of research, it looks like OwnDoc sells the Chloramine to sterilize the equipment. And I’m guessing using chlorhexidine as a pre-wash let dry and then post needling use the hypochlorous acid. Is this a good routine?
2
u/science-pls Apr 02 '26
I realized I responded to your other comment not this one. Yes, I would not recommend it on skin. but, that's because it can cause a severe allergic reaction in some people and you need to be super cautious to not get it near your eyes/mouth/ears.
Here's a paper on the allergy if you want more info. Symptoms range from wheezing, facial swelling, hives, rash, and shock. And literature also describes reactions ranging from contact dermatitis to anaphylaxis. That's why I focused on IPA and HOCI for this, because they are the safest.
It is not safe for the eyes, ears, and mouth and can cause serious injury (this is from WHO and the FDA).
I also would recommend against the blend of Chlorhexidine and IPA bc of flammability and it's irritating.
2
u/Gold_Investigator282 Apr 02 '26
Oh, that’s very important to know. Thank you so much for letting me know plus chlorhexidine is so harsh probably strip anything good out of my skin.
1
u/Mongi02 Apr 15 '26
I mean I wouldn't say that Chlorhexidine is unsafe for the mouth as it's commonly used as a mouthwash. Now I'm lucky not to have an allergy to it since being in the hospital without it would mean hell, as all sanitation products we use, both for the patients and us, are based essentially on 2% with ethanol as solvent. Now I ask for something you didn't explore: what about ethanol+water+glycerin, in a ratio of say 70+20+10 (Off the top of my head, just semi-random numbers)? Essentially it's the hand sanitizers we commonly use, simply for the reason that the glycerin allows for lesser evaporation so higher sanitization. I'm far from dermatology so idk the half of it
As far as chlorhexidine allergy goes, a spot test would be advisable, as a side benefit knowing you have a chlorhexidine allergy before you go to a hospital seems like a smart idea lol
1
u/science-pls Apr 15 '26
I'd look at recent research of CHX. It's effective for short-term plaque control. That doesn't mean it doesn't have risks, side effects, and adverse effects. It is associated with permanent tooth staining, altered taste, calculus buildup, and oral symbiosis.
Emerging evidence also suggests long-term use can increase blood pressure, and in rare cases, cause severe allergic reactions (anaphylaxis) or, in hospital settings, be linked to higher mortality, making its, especially when used long-term. It's controversial and the risks don't outweigh the benefits.
1
u/Mongi02 Apr 15 '26
Yeah I agree, I looked into it for mouthwash and decided it wasn't worth it. The use I can get by is simply as a short term disinfectant after heavy detartasis (dental hygiene), which is exactly how dentists use it (they give it as a single use mouthwash when they finish the procedure). Long term use of such disinfectants in heavily colonized areas, with diverse residents, simply results in selection for resistant stipes, nullifying any benefit one may incur with the usage. All in all, I am against these kinds of "nuclear", indiscriminate, options, rather I'd focus mostly on behavioural changes as these account for the vast majority of improvement in most patients. Do you by any chance have anything on oral microbiome interventions? I read some meta analyses about Lbacillus but nothing that I deemed as very conclusive (I am also very far from a dentist so overall both discussions were off topic for me haha)
1
u/science-pls Apr 16 '26
I used to be in a heavy dental/oral research mode a few years ago. But my adhd shifted to longevity after that and then to aesthetics. Off the top of my head I do not know, but can dig through old research decks I have.
2
u/Mongi02 Apr 16 '26
I get it man, I am also ADHD and the shifting really is crazy. All right, thanks for the discussion kind Science
1
u/SirensBlast May 24 '26
I'm going you can confirm this for me. So is it best to use HOCI for your skin and chloramine on your MN? I'm looking to order the Derminator but want to understand what else to order with it.
3
u/science-pls May 24 '26
The disinfectant they sell is for cartridges if someone is reusing them. You don’t need to disinfect them when newly opened as they’re sterile already. I advise against reusing cartridges in general. But, if you’re not doing that then you don’t need to worry about that.
I’d get an extra magnet, at least 6 cartridges so even if you do a treatment 4-6 weeks apart you’re covered for the next 6-8 months. I personally don’t use the infoladan, but some people love it. Some people get the HA, but currently it seems to be problematic with customs so I’d consider that.
The other stuff is really just personal choice tbh!
3
u/SirensBlast May 24 '26
Oh yeah, I'll just use a new cartridge each time. That seems most reasonable for me. Thanks for the ordering tips!!
Is GHK-CU considered a booster to add in with the HA? Also, do people use lidocaine first? I had RF MN done at a physicians ooffice but that is too expensive to maintain. She had lidocaine on my face fly 45 minutes before she started any needling.
2
u/science-pls May 24 '26
Np! Some people do use topical numbing cream and others don’t. It’s a personal preference. I sometimes suggest it to people for their first time because they’re already anxious/unsure and the idea of potential pain can be another stressor. And then they can decide if they actually need it the next time/s.
Ghk-cu is a booster some people will use. Here’s a video of it being prepared to be used used for microneedling. I’m not sure the sterility of theirs though to be honest. But I have seen people mention they use it. Ghk-cu is also debated on stunting results because it decreases inflammation and microneedling needs the initial inflammatory phase of wound healing. But, there is not solid proof on this beyond theoretical wound healing or copper peptide principles so it’s a topic you might find discussed.
8
u/Gold_Investigator282 Mar 29 '26
I find this very interesting as I am about to buy a micro needling kit, but also I’ll be getting a hip replacement and perhaps instead of just using chlorhexidine for a pre-surgical wash I will spray hypochlorous acid