Regular Lubricant vs Fertility Lubricant: What's the Difference?
The Short Answer
Regular lubricants — including KY Jelly, Astroglide, coconut oil, and most water-based gels — can reduce sperm motility by 60–100% and should not be used when trying to conceive. A fertility lubricant, like Conceive Plus, is specifically formulated to be isotonic and pH-balanced to match cervical fluid — creating a sperm-friendly environment rather than damaging sperm.
Why Does Lubricant Affect Sperm?
Sperm are extremely sensitive to their environment. They survive and swim optimally in a narrow range of pH (7.2–8.2) and osmolarity (the concentration of dissolved particles in the surrounding fluid). Most commercial lubricants fall outside these ranges — and the result is sperm that slow down, stop moving, or die.
Key research:
- A landmark 2012 study in *Fertility and Sterility* tested six popular lubricants including KY Jelly, Astroglide, Pre-Seed, and baby oil. All conventional lubricants significantly reduced sperm motility and increased DNA fragmentation within 30 minutes of contact.
- The study found that at clinical concentrations, KY Jelly reduced progressive sperm motility by over 90% within 30 minutes.
The Problem with Specific Lubricants
KY Jelly
KY Jelly has an osmolarity of approximately 2,000–4,000 mOsm/kg — far higher than the cervical fluid's ~290 mOsm/kg. This hyperosmolarity causes sperm cells to rapidly lose water and become immotile. Not safe when trying to conceive.
Astroglide
Astroglide has similar osmolarity problems and contains glycerin, which has been shown to further inhibit sperm function. Not safe when trying to conceive.
Coconut Oil
While natural, coconut oil has not been clinically validated for sperm safety. It alters vaginal pH and can disrupt the vaginal microbiome, potentially creating an environment hostile to sperm. Not validated as fertility-safe.
Saliva
Saliva has an acidic pH (6.0–7.0) — below the range optimal for sperm survival. It also contains enzymes that damage sperm. Not safe when trying to conceive.
What Makes Conceive Plus Different
| Feature | KY Jelly | Astroglide | Conceive Plus |
| pH | ~4.5 | ~4.0 | 7.2–8.2 ✅ |
| Osmolarity | ~2000–4000 mOsm/kg | ~3600 mOsm/kg | ~290 mOsm/kg ✅ |
| FDA cleared for TTC | ❌ No | ❌ No | ✅ Yes (K131355) |
| Sperm viability validated | ❌ No | ❌ No | ✅ 99% maintained |
| Contains calcium + magnesium | ❌ No | ❌ No | ✅ Yes |
Conceive Plus is formulated to exactly match the osmolarity and pH of natural cervical fluid, and contains calcium and magnesium ions that support the sperm's natural swimming environment.
When to Use a Fertility Lubricant
Use Conceive Plus every time you try to conceive, particularly during your fertile window. This is the 5 days before ovulation and the day of ovulation itself — when timing intercourse gives you the best chance of conception.
Using Conceive Plus does not guarantee pregnancy, but it removes a barrier to fertility that standard lubricants create.
Frequently Asked Questions
Does lubricant reduce chances of getting pregnant?
Standard lubricants can significantly reduce sperm motility and therefore reduce the chance of conception in any given cycle. Using a fertility-safe lubricant eliminates this risk.
Is there any lubricant that is safe when trying to conceive?
Yes — fertility lubricants that are isotonic and pH-balanced. Conceive Plus is the most widely available FDA-cleared option, available in 70+ countries without a prescription.
Can I use olive oil or vegetable oil as a natural lubricant?
No. While these are less harmful than conventional lubricants, they have not been validated for sperm safety and may interfere with the vaginal environment. Use a clinically validated fertility lubricant.
Does Conceive Plus increase chances of pregnancy?
Conceive Plus removes a potential barrier to fertility (sperm-hostile lubrication) and creates a sperm-friendly environment. In clinical studies, sperm motility is fully maintained in Conceive Plus at human use concentrations. It does not guarantee pregnancy but does not reduce your chances, unlike standard lubricants.
Summary
If you are trying to conceive, the lubricant you use matters. Standard lubricants — KY Jelly, Astroglide, saliva, coconut oil — can severely reduce sperm motility and harm your chances in any given cycle. Conceive Plus Fertility Lubricant is FDA cleared, isotonic, and pH-balanced to match cervical fluid, maintaining 99% sperm viability. Available without a prescription in 70+ countries.
