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Published July 2016

What is the difference between WB and VM?

Both YES VM vaginal moisturiser and YES WB water based lubricants are pH matched to typical vaginal pH which means both are ideal for vaginal use. A perfect vaginal lubricant’s osmolality would be hypo to iso-osmotic, this means it would release water more rapidly, rehydrating tissues and enabling intercourse

YES WB is slightly hypo-osmotic which means it is designed to release water more rapidly than YES VM, to instantly rehydrate and lubricate dry tissues to enable intercourse immediately.

YES VM is Iso-osmotic which means it is a perfect vaginal moisturiser because its osmolality is iso-osmotic, this means it is identical in water concentration to vaginal tissues and will release water as and when it is needed over extended periods, such as 1-3 days.

YES VM Vaginal Moisturiser is designed to release water to rehydrate dry vaginal tissues as needed, over extended periods, such as 1-3 days. YES VM will instantly sooth and calm irritation, itching and burning as does YES WB. YES VM is more of a slow release moisturiser, the rate of moisturising is determined by the degree of vaginal tissue dryness. The drier they are the more water will be released. YES VM puts your body in control of rehydrating herself.

Published July 2016

Why are Osmolality and pH important?

Osmolality – defined by The Yes Yes Company Ltd (with thanks to Smitten Kitten too)

Osmolality, a more formal definition, is the measure of dissolved particles per unit of water in a solution or plasma (also called the concentration). The osmolality of a lubricant is important because the epithelial (outer) layer of skin is constantly trying to maintain an equilibrium of osmolality (remember Osmosis from school biology lessons?) between the skin cells and the lubricant on the outside wall of that cell.

  • Osmosis is the process where water moves back and forth across cell membranes in response to the concentration of chemicals in the liquid (here we mean lubricant) on the outside of the cell. Osmosis tries to balance the concentration on both sides.
  • When a lubricant has a higher osmolality than human cells or bodily fluids (like blood) it is calledhyper-osmotic. When tissues are in contact with a hyper-osmotic lubricant they try to dilute the lubricant by releasing water. This can cause the cell to die as it becomes super concentrated and no longer able to function. The net result is the layer of cells break down and the body’s barrier to infection is compromised
  • So hyper-osmotic lubricants can irritate the skin, cause the barrier layer of skin to be damaged and dehydrated and leave a mucous membrane (anal or vaginal) more susceptible to bacterial infections or STI contraction
  • When a lubricant has a lower osmolality than human cells or bodily fluids (like blood) it is calledhypo-osmotic. When tissues are in contact with a hypo-osmotic lubricant they try to pull water from the lubricant into the cell. This means that a slightly hypo-osmotic lubricant would rehydrate dry tissues, but an extremely hypo-osmotic lubricant could cause these cells to burst.

Therefore in our view:

  • A Perfect Anal Lubricant’s osmolality would be iso-osmotic, meaning it would have identical osmotic pressure, or its concentration would be identical, to the tissues to which it is applied
  • A Perfect Vaginal Lubricant’s osmolality would be hypo to iso-osmotic, meaning it would have similar osmotic pressure, or its concentration would be similar, to the tissues to which it is applied
  • A Perfect Vaginal Moisturiser’s osmolality would be iso-osmotic, meaning it would have identical osmotic pressure, to vaginal tissues as it can be present in the vagina for extended periods, like 1-2 days.
  • A Perfect Sperm Friendly Lubricant’s osmolality would be iso-osmotic with semen, which is slightly higher than typical human tissues.
  • An iso-osmotic lubricant, to most human tissues, would have an osmolality of 270-310 mOsm/kg as this encompasses the osmolality of human plasma.

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