Which Products Damage Sperm?

We do not recommend the use of Replens, FemGlide, Very Private, KY Jelly, Summers Eve, KY Liquid, Astroglide, Moist Again or Klick products. The reasons are given in the Table below.

We also do not recommend the following common 'home' remedies for vaginal dryness - egg white, saliva, tap water, mineral oil or baby oil. The reasons are given in the Table below.

The optimum pH value for sperm migration and survival in the cervical mucus is between 7.0 and 8.5 (according to the World Health Organization manual for examination of human semen and sperm-cervical mucus interaction 4th edition 2000). Sperm are very sensitive to low (acidic) pH and, to a lesser extent, elevated (alkaline) pH. Below pH levels of 6.9, sperm die at a rate that increases with lowering pH.

Sperm are also sensitive to both high and low osmolarities (ion concentration in solution) because these can cause them to either shrink or swell beyond their "critical volume limits". A physiologic osmolarity around 360 mOsm/kg (that of semen) is best for sperm function.


Product

pH

Osmolarity (mOsm/kg)

Too low

Physiologic for sperm 7.0 - 8.5

Too high

Too low

Physiologic for sperm 270 - 380

Too high

Replens

2.79

>1000

FemGlide

7.22

162

Very Private

6.13

>1000

KY Jelly

4.52

>1000

Summer's Eve

4.4

>1000

KY Liquid

3.82

>1000

Astroglide

3.45

>1000

Moist Again

5.29

187

Klick

6.12

880

Pre-Seed

 

7.3

    

314

Egg White

8.95

238

Saliva

7.08

151

Tap Water

8.01

<100

Mineral Oil

 10.50

 >1000

Baby Oil

 7.16

 >1000

 

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