Fertility friendly lubricant: how lube affects sperm and what matters to couples

Your fertile days are here, the tube is on the nightstand, and your vagina stays dry. Then the question comes up: Does lubricant harm sperm when you are trying to conceive, or is it harmless?

You are not alone with this question. In a study of 296 women aged 30 to 44 who wanted to get pregnant, 25% used lubricant (Steiner 2012). In pooled cohorts from Denmark and North America, the figure was 17.5% (McInerney 2018).

At first glance, the data seem contradictory. In the lab, many lubricants clearly slow sperm down. In couples without known fertility problems who used lubricant during sex, however, the chance per cycle was not lower in observational studies (Steiner 2012, McInerney 2018).

Here you will find what the studies show in detail, what lies behind “sperm friendly,” what saliva and oils do to sperm, and when dryness is a matter for your gynecologist.

Lubricant when trying to conceive: what happens to sperm in the lab

Most of the data come from laboratory experiments. In these, a semen sample is mixed with lubricant, often at a proportion of 10%, in a few studies at a lower proportion. What is mainly measured is how many sperm are still moving forward after minutes or hours, known as progressive motility. Which values count as normal in a semen analysis is covered in the article Normal sperm count and semen analysis values.

The US professional society ASRM (American Society for Reproductive Medicine) writes, based on a 1996 study of four products: Commercially available water-based lubricants inhibit sperm motility in the lab by 60% to 100% within 60 minutes, and canola oil has no comparable disadvantage. Lubricants based on hydroxyethylcellulose showed no detectable disadvantage for semen values (ASRM 2022).

Besides motility, the genetic material of the sperm matters. After 4 hours, FemGlide and K-Y Jelly significantly worsened the chromatin quality of the sperm, while with Pre-Seed the DNA fragmentation index did not differ from the control (Agarwal 2008). In the Australian study, there were no significant effects on DNA integrity (Mowat 2014).

Why lubricants slow sperm down is not understood. Possible explanations include direct toxicity or indirect factors such as viscosity, pH, or osmolality (Tomlinson 2023).

Laboratory experiments have clear limits. A systematic review found 24 studies on 35 over-the-counter lubricants, 22 of them in the lab and only 2 in the body. Most examined only motility, and the studies reported little or nothing about pregnancies. According to the authors, that is not enough for an evidence-based guideline (Gumerova 2024).

What should make a lubricant sperm friendly: osmolality and pH

“Sperm friendly,” “conception friendly,” or “fertility friendly” are manufacturer claims. There is no published guideline that helps professionals and couples choose a sperm friendly lubricant (Gumerova 2024). Two measured values are discussed above all: osmolality and pH.

Osmolality: how concentrated a lubricant is

Osmolality indicates how many dissolved particles are in a liquid, measured in milliosmoles per kilogram (mOsm/kg). According to an advisory note from WHO, UNFPA, and FHI360, it is 2,000 to 6,000 mOsm/kg for most commercially available lubricants. Vaginal fluid is at 260 to 290 mOsm/kg, semen at 250 to 380 mOsm/kg. The note measured, for example, 2,007 mOsm/kg for K-Y Jelly and 1,491 mOsm/kg for Replens (WHO 2012).

Ideally, according to the WHO, it would be no more than 380 mOsm/kg, to keep damage to the mucous membrane as low as possible. Because that was not practical for procurement, the note recommended, as an interim measure, no more than 1,200 mOsm/kg (WHO 2012). The current WHO/UNFPA specification of 2026 requires less than 1,200 mOsm/kg for water-based lubricants, achievable with a glycol content below about 8.3% by weight (WHO/UNFPA 2026).

pH: how acidic a lubricant is

According to the WHO, the pH of the vagina is typically around 4.0. The WHO note of 2012 recommended a pH of around 4.5 for water-based lubricants used vaginally. The 2020 specification required 5.0 to 7.0, which, according to the WHO, in practice committed manufacturers to a pH of at least about 4.5. Since 2026, a pH of 4.0 to 7.0 with a tolerance of ± 1.0 has applied to water-based lubricants (WHO/UNFPA 2026). In the table of the WHO note, K-Y Jelly had a pH of 4.55 and Replens a pH of 2.98 (WHO 2012).

Semen itself is alkaline: According to the WHO laboratory manual, a pH below 7.2 can indicate that the alkaline secretion of the seminal vesicles is missing (WHO 2021). A lubricant with the acidic pH of the vagina therefore does not have the pH of semen. Lubricants marketed as “pH balanced” and “fertility friendly” showed no benefit in couples (McInerney 2018).

Important context: All of these WHO values are specifications for procuring additional lubricants for condoms in health programs, not for compatibility with sperm. In 2012, the WHO gave protection of the mucous membrane as the reason for the osmolality limit (WHO 2012, WHO/UNFPA 2026).

What a 2025 measurement shows

A study from Chiang Mai measured the osmolarity and pH of the finished mixtures, each with 10% lubricant in simulated vaginal fluid. Because the samples were diluted, the values cannot be compared with those of the undiluted products.

The pH of all mixtures was between 4.45 and 4.58. The Durex lubricant reduced motility at every time point and was the only product that also reduced the share of live sperm after 60 minutes. Pre-Seed was on par with the control solution at all time points (Pradit 2025). Whether osmolality is the cause of such differences is not understood (Tomlinson 2023).

Pre-Seed, Conceive Plus, and other fertility lubricants in studies

Special lubricants are sold for the time when you are trying to conceive. Pre-Seed, together with K-Y Jelly and Astroglide, is among the most frequently studied lubricants (Gumerova 2024). We name products here only because the studies name them. This is not a recommendation.

Studies with favorable results

• Cleveland Clinic: Pre-Seed did not significantly reduce progressive motility compared with culture medium, and the DNA fragmentation index after 4 hours did not differ either (Agarwal 2008).
• 24-hour survival test: Pre-Seed showed no toxicity to sperm, whereas three other gels used in fertility practices did (Vargas 2011, short communication).
• 22 donors: With Pre-Seed, progressive motility dropped slightly (about 4%) but significantly after 30 minutes. After that, it stayed high. The authors see Pre-Seed as well as canola, mustard, and baby oil as possibly sperm friendly (Sandhu 2014).
• Australia: Among 9 lubricants, Pre-Seed had the smallest negative effect (progressive motility 86%, vitality 92%), with Conceive Plus just behind. The study tested 10 samples (Mowat 2014).
• Review: A second systematic review of 20 studies concludes that Pre-Seed mostly shows only minimal disadvantages, whereas synthetic lubricants such as K-Y Jelly, Replens, and Astroglide harm motility and chromatin (Molin 2024).

Studies with critical results

At the University of Pretoria, 60 semen samples with normal values were mixed with Pre-Seed, Optilube, Yes Baby, olive oil, or egg white. All lubricants except egg white significantly reduced progressive motility up to 24 hours after liquefaction. Sperm in Pre-Seed were more motile than in Yes Baby, but the authors consider the advertising claim “sperm friendly” refuted for these products (Markram 2022). The BVF and DGGG portal frauenaerzte-im-netz.de reported on this under the headline “Fertility lubricants slow down sperm” (frauenaerzte-im-netz.de 2022).

In a British study of 12 donor samples, all gels led to a significant loss of motility after 1 and 2 hours, including FertilSafe Plus and Fertile Check, which are marketed as sperm friendly. FertilSafe Plus performed best: After one hour, progressive motility was 24%, compared with 47% in the control. Worst among the gels were two Durex pleasure products with 11% and 15% after 60 minutes. Despite the losses, the authors rate the gels marketed as sperm friendly as the best in the test, while saliva and pleasure-only products performed worst (Tomlinson 2023).

Brand is not the same as formulation

Brand names say little about compatibility. In a Spanish study, the tested Durex lubricant, of all things, was the only one of five that did not harm sperm (Soriano 2021). In the British study and in the Chiang Mai measurement, by contrast, Durex products performed worst (Tomlinson 2023, Pradit 2025). What matters is the specific formulation, not the brand.

Whether any of these products leads to more pregnancies was not examined in the lab studies. In couples, lubricants marketed as “fertility friendly” showed no benefit compared with no lubricant at all (McInerney 2018). More on this in the next section.

Is lubricant harmful when trying to conceive? What data from couples show

In the end, what matters to you is whether you get pregnant, not motility in a test tube. There are observational studies on this. What is measured is fecundability, that is, the chance of becoming pregnant in one cycle. A fecundability ratio of 1 means the same chance as without lubricant. Values below 1 mean a lower chance, values above 1 a higher chance.

Data box: lubricant in the fertile window

In a prospective study, 296 women aged 30 to 44 without known fertility problems kept a cycle diary for up to 6 months. Women who used lubricant in the fertile window had a comparable chance per cycle to women without lubricant (fecundability ratio 1.05; 95% CI 0.59 to 1.85; Steiner 2012).

The wide confidence interval shows how limited the evidence is: The range extends from a clearly lower to a clearly higher chance.

A pooled analysis of cohorts from Denmark and North America is considerably larger, with 6,467 women trying to conceive who had no history of infertility. They most often used water-based lubricants that were not pH balanced (11.4%; McInerney 2018).

No type of lubricant was associated with lower fertility. The products marketed as “fertility friendly,” however, showed no benefit either. All confidence intervals include 1, so none of the values shows a confirmed difference (McInerney 2018).

ASRM summarizes: Even though some lubricants worsen sperm values in the lab, their use did not affect the chance per cycle in couples trying to conceive (ASRM 2022).

Three points help put this in context:

• Observation instead of experiment: The women decided for themselves whether and which lubricant to use. A 2014 review considered the effect of lubricants on fertility unresolved because of contradictory lab and couple data and considered a randomized trial necessary (Mesen 2014). We have not found such a trial to this day.
• Couples without known problems: Both studies examined women without known fertility problems. For couples with reduced sperm quality, they provide no findings of their own. What else influences sperm quality is explained in the guide How to improve sperm quality.
• Sex only: According to the authors of the 2012 study, the results apply to lubricant during intercourse, not to gel used during vaginal ultrasound, the gynecological exam, or intrauterine insemination (Steiner 2012).

Saliva, oils, and egg white: what home remedies do to sperm

A tube is not always at hand. For home remedies there are almost only lab data, and they vary widely.

Saliva and sperm

Saliva is quickly at hand but unfavorable for sperm in the lab. As early as 1982, saliva was found to have an adverse effect on sperm motility and activity, and the authors advised couples trying to conceive against using it as a lubricant (Tulandi 1982). Even heavily diluted to 6.25%, saliva still significantly reduced progressive motility (Anderson 1998). ASRM counts saliva among the substances that cause harm even at this dilution (ASRM 2022). In a British study, saliva served as the negative control, and even the gels with the greatest losses performed better (Tomlinson 2023).

Oils

With oils, the type makes a big difference:

In the large cohort study, oil-based lubricant during sex was not associated with a lower chance (fecundability ratio 1.23; McInerney 2018). If you use condoms for contraception in between: Oils, baby oil, and Vaseline damage latex condoms (WHO 2012).

Egg white

In the Pretoria study, raw egg white was the only one of five tested substances that did not reduce progressive motility. The authors therefore rate egg white as sperm friendly (Markram 2022), and a review classifies egg white as nontoxic (Molin 2024). These are lab data. The same portal adds a safety note: Egg white can contain salmonella and should not be eaten raw (frauenaerzte-im-netz.de 2022). We have not found data on the safety of raw egg white in the vagina.

Lubricant for insemination and semen samples

According to its authors, the results of the 2012 study explicitly cannot be applied to intrauterine insemination, vaginal ultrasound, or the gynecological exam (Steiner 2012).

Semen sample: The WHO laboratory manual advises avoiding lubricant when collecting semen for examination in the lab, because it can contaminate the ejaculate and change its properties. If there is no alternative, only validated, non-spermatotoxic lubricants should be used (WHO 2021). In a randomized crossover study of 22 healthy men, the isotonic lubricant Pre-Seed changed neither motility nor vitality nor DNA damage during semen collection (Agarwal 2013). Before a semen sample, ask your practice what is allowed there.

Ultrasound gel: Ultrasound gel is used for vaginal ultrasound during cycle monitoring. The Aquasonic ultrasound gel was toxic to sperm in the 24-hour test (Vargas 2011), in a Spanish study after as little as half an hour, and a second ultrasound gel was slightly toxic after 2 hours (Soriano 2021).

IUI: We have not found studies that compare pregnancy rates for intrauterine insemination with and without lubricant or ultrasound gel. You can ask your practice which gel it uses. How the treatment works is covered in the article IUI treatment.

At-home insemination: We have not found data on this either. For semen collection for examination in the lab, the WHO advises avoiding lubricant where possible (WHO 2021). Whether the same applies to at-home insemination has not been studied. Legal and health background is covered in the article At home insemination and private sperm donation.

Dryness when trying to conceive: stress, clomiphene, and other causes

Couples undergoing a fertility evaluation often experience sexual dysfunction, often because the vagina does not become sufficiently moist. This leads to more lubricant use (Anderson 1998). Various causes can be behind the dryness.

Stress and pressure: How much the pressure of trying to conceive itself contributes to dryness has hardly been studied. It is documented that couples in an evaluation are often affected (Anderson 1998), but not how much of this is due to stress.

Arousal and hormones: Insufficient moistening of the vagina, the lubrication disorder, is one of the sexual dysfunctions (frauenaerzte-im-netz.de). According to frauenaerzte-im-netz.de, a purely physical arousal disorder is rare. In those cases, possible causes include a circulation disorder in the genital area, insufficient moisture production despite sexual desire, estrogen deficiency, or side effects of an antidepressant. Treatment includes, among other things, lubricating creams or local estrogen therapy as a cream or suppository. The page on frauenaerzte-im-netz.de is undated and, according to the provider, is currently being updated.

Clomiphene: In the US prescribing information for the active ingredient clomiphene, vaginal dryness is listed among the adverse events that occurred in less than 1% of patients in clinical trials (US prescribing information for clomiphene 2025). If you notice dryness during hormone treatment, talk to your practice about it.

When to get it checked by a doctor

Women who suspect a sexual dysfunction in themselves, such as pain during intercourse (dyspareunia), should definitely seek medical help, according to frauenaerzte-im-netz.de. An appointment with your gynecologist makes sense if:

• sex hurts,
• the vagina repeatedly stays dry despite desire,
• the dryness began with a new medication, such as clomiphene or an antidepressant.

Also tell them which lubricant you use. The British NICE guideline recommends asking people trying to conceive about over-the-counter products such as vaginal lubricants and advising them on possible effects on fertility or pregnancy (NICE NG257, 2026).

What professional societies recommend

The statements therefore diverge. More pregnancies from a particular lubricant have not been shown: In the large cohort study, “fertility friendly” products showed no benefit, and no type showed a confirmed difference (McInerney 2018). We have not found guidelines from Germany, Austria, and Switzerland with a statement on lubricants.

What to look for when buying

There is no published guideline on selection (Gumerova 2024). These points help you interpret the claims on the packaging:

• “Sperm friendly” is a manufacturer claim. Products marketed this way also slowed sperm significantly in the lab (Markram 2022, Tomlinson 2023), though in the British study less than pleasure-only products (Tomlinson 2023). Check whether the manufacturer states how, and with what result, compatibility with sperm was tested.
• Osmolality and pH, if stated. For comparison: Vaginal fluid is at 260 to 290 mOsm/kg, semen at 250 to 380 mOsm/kg (WHO 2012). For pH, the vagina is at about 4.0 (WHO/UNFPA 2026), semen at 7.2 or higher (WHO 2021). It has not been proven that lubricants with such values protect sperm (Tomlinson 2023).
• Base. Water-, oil-, or silicone-based: In the large cohort study, none of these types was associated with a lower chance (McInerney 2018). With oils, the laboratory results differ greatly by type.
• Medical device. The EU guidance on the classification of medical devices names vaginal lubricants as an example of Class IIb. An example does not automatically mean that a product is classified as a medical device, however (MDCG 2026). What applies to a specific product is stated on the packaging and in the instructions for use.
• No ultrasound gel as a substitute. An ultrasound gel used in fertility practices was toxic to sperm in two studies (Vargas 2011, Soriano 2021).
• No spermicide. A product with the spermicide nonoxynol-9 served as a comparison in a lab study, after which the sperm were immotile and no longer viable (Kutteh 1996).

What you can do now

If you need lubricant to feel relaxed during sex: In couples without known fertility problems, this was not associated with a lower chance in observational studies (McInerney 2018). In the lab, the products performed very differently, and saliva and olive oil performed poorly (Anderson 1998). Stricter rules apply to semen samples and insemination, so ask your practice about them.

You can plan your fertile days with our Ovulation Calculator. It estimates them based on the calendar and does not confirm ovulation. How LH tests work is explained in the article Ovulation test.

If it has not worked for quite a while, an evaluation of both partners is part of the process. What is examined in women is covered in the article Fertility test for women, and when an evaluation makes sense is covered in the guide to infertility.

Frequently asked questions

Is lubricant harmful when trying to conceive?

In the lab, many lubricants slow sperm down, some commercially available products by 60% to 100% within 60 minutes (ASRM 2022). In couples without known fertility problems, however, lubricant during sex was not associated with a lower chance per cycle (Steiner 2012, McInerney 2018). We have not found a randomized trial that settles this, and a review considered one necessary as early as 2014 (Mesen 2014).

Which lubricant is sperm friendly?

There is no guideline by which a sperm friendly lubricant can be chosen (Gumerova 2024). According to ASRM, lubricants based on hydroxyethylcellulose, canola oil, and mineral oil showed no detectable disadvantage in the lab (ASRM 2022). For baby oil, which consists of mineral oil, more recent lab studies did find a temporary drop, however (Sandhu 2014, Pradit 2025). Products marketed as sperm friendly also slowed sperm significantly in two studies (Markram 2022, Tomlinson 2023), though in the British study they performed better than pleasure-only products (Tomlinson 2023).

What do studies show on Pre-Seed and Conceive Plus?

Pre-Seed is one of the most frequently studied lubricants and showed only minimal disadvantages in most lab studies (Molin 2024). In an Australian lab study of 10 samples, Conceive Plus came in just behind Pre-Seed (Mowat 2014). A study from Pretoria found significantly lower progressive motility with Pre-Seed too (Markram 2022). More pregnancies have not been shown for any of the products, and lubricants marketed as “fertility friendly” showed no benefit in couples (McInerney 2018).

Does saliva harm sperm?

In the lab, yes. Saliva worsened sperm motility and activity (Tulandi 1982), even heavily diluted to 6.25% (Anderson 1998). In a British study, even the gels with the greatest losses performed better than saliva (Tomlinson 2023).

Can I use oil as a lubricant?

That depends on the oil. Olive oil reduced progressive motility even at a low concentration (Anderson 1998). Canola oil showed no disadvantage or only an initial one (Kutteh 1996, Sandhu 2014). Mineral oil or baby oil has no disadvantage according to ASRM (ASRM 2022), but more recent lab studies show a temporary drop (Sandhu 2014, Pradit 2025). Oils damage latex condoms (WHO 2012).

Is egg white an alternative as a lubricant?

In a lab study, raw egg white was the only one of five tested substances that did not reduce progressive motility (Markram 2022). There are only lab data on this. Egg white can contain salmonella (frauenaerzte-im-netz.de 2022).

Can I use lubricant for a semen sample or before an IUI?

For semen collection for examination in the lab, the WHO advises avoiding lubricant where possible and, if necessary, using only validated, non-spermatotoxic ones (WHO 2021). According to the study authors, the data on sex cannot be applied to intrauterine insemination (Steiner 2012). Ask your practice what is allowed there.

Can clomiphene make the vagina dry?

Vaginal dryness is listed in the US prescribing information for clomiphene among the adverse events that occurred in less than 1% of patients in clinical trials (US prescribing information for clomiphene 2025). Bring up any symptoms with your practice.

Sources

Guidelines and statements

• Practice Committee of ASRM and SREI: Optimizing natural fertility: a committee opinion, Fertil Steril 2022;117:53-63, ASRM, 2022
• NICE NG257: Fertility problems, assessment and treatment, chapter Advice about factors that can affect fertility, recommendation 1.13.1, NICE, March 31, 2026
• WHO laboratory manual for the examination and processing of human semen, 6th edition, World Health Organization, 2021
• Use and procurement of additional lubricants for male and female condoms: WHO/UNFPA/FHI360 advisory note (WHO/RHR/12.33), WHO, UNFPA, and FHI360, 2012
• WHO/UNFPA specifications for personal lubricants, WHO Technical Report Series No. 1067, Annex 6, WHO, 2026
• Shin D et al.: Sexual dysfunctions in male patients with infertility: recommendations from the Fifth International Consultation for Sexual Medicine (ICSM 2024), Sex Med Rev 2026;14(1):qeaf073

Reviews

• Gumerova E, Rimmer MP, Gellatly SA: Do sperm and lubricants gel well with each other? A systematic review, Hum Fertil (Camb) 2024;27(1):2285349
• Molin EAD, Leite GAA, Lazzari VM: A systematic review focused on lubricant use and sperm quality, J Appl Toxicol 2024;44(10):1470-7
• Mesen TB, Steiner AZ: Effect of vaginal lubricants on natural fertility, Curr Opin Obstet Gynecol 2014;26(3):186-92

Studies in couples

• Steiner AZ, Long DL, Tanner C, Herring AH: Effect of vaginal lubricants on natural fertility, Obstet Gynecol 2012;120(1):44-51 (full text)
• McInerney KA et al.: Lubricant use during intercourse and time to pregnancy: a prospective cohort study, BJOG 2018;125(12):1541-8

Laboratory studies

• Tulandi T, Plouffe L Jr, McInnes RA: Effect of saliva on sperm motility and activity, Fertil Steril 1982;38(6):721-3
• Kutteh WH et al.: Vaginal lubricants for the infertile couple: effect on sperm activity, Int J Fertil Menopausal Stud 1996;41(4):400-4
• Anderson L, Lewis SE, McClure N: The effects of coital lubricants on sperm motility in vitro, Hum Reprod 1998;13(12):3351-6
• Agarwal A et al.: Effect of vaginal lubricants on sperm motility and chromatin integrity: a prospective comparative study, Fertil Steril 2008;89(2):375-9
• Vargas J et al.: Sperm toxicity of “nonspermicidal” lubricant and ultrasound gels used in reproductive medicine, Fertil Steril 2011;95(2):835-6
• Agarwal A, Malvezzi H, Sharma R: Effect of an isotonic lubricant on sperm collection and sperm quality, Fertil Steril 2013;99(6):1581-6
• Sandhu RS et al.: In vitro effects of coital lubricants and synthetic and natural oils on sperm motility, Fertil Steril 2014;101(4):941-4
• Mowat A et al.: The effects of vaginal lubricants on sperm function: an in vitro analysis, J Assist Reprod Genet 2014;31(3):333-9
• Soriano MJ et al.: The Use of Vaginal Lubricants and Ultrasound Gels Can have Deleterious Effects on Sperm Function, J Hum Reprod Sci 2021;14(2):162-6
• Markram J, Griessel L, Girdler-Brown B, Outhoff K: Sperm-friendly lubricant: Fact or fiction, Int J Gynaecol Obstet 2022;159(1):111-5
• Tomlinson J, Pooley K, Tomlinson M: Sperm toxicity testing on lubricant gels: should we be recommending “fertility-friendly” specialist products?, Hum Fertil (Camb) 2023;26(5):1028-31
• Pradit L et al.: The effects of coital lubricants on sperm motility and vitality, JBRA Assist Reprod 2025;29(2):311-6 (full text)

Law and prescribing information

• MDCG 2021-24 Rev.1: Guidance on classification of medical devices, Medical Device Coordination Group, European Commission, April 2026
• US prescribing information for clomiphene citrate tablets, DailyMed, U.S. National Library of Medicine, as of February 2025

Consumer information

• Fertility lubricants slow down sperm, frauenaerzte-im-netz.de (BVF and DGGG), May 30, 2022
• Sexual disorders: clinical picture, frauenaerzte-im-netz.de (BVF and DGGG), undated
• Sexual disorders: treatment, frauenaerzte-im-netz.de (BVF and DGGG), undated