Lubricant and fertility – does it harm sperm?

What happens in the laboratory

When sperm are examined in a test tube, many commercially available lubricants impair their motility. A systematic review of twenty studies found this above all for synthetic products containing methylparaben and glycerin. What matters is less the brand than two physical properties: osmolality and pH value.

What was measured in everyday life

A large study of 6,467 women from Denmark and North America compared how long it took to become pregnant. 17.5 per cent used lubricants. No disadvantage could be established – neither for simple water-based products nor for those marketed as particularly "fertility-friendly". Oil-based and silicone-containing products came out slightly better in the calculation, but without statistical certainty.

Why this is not a contradiction

In a test tube, a high concentration of lubricant meets sperm undiluted. During intercourse the quantity is smaller and the distribution is different. What is measurable therefore does not have to be noticeable.

A limitation that matters to us

Only women who had been trying for at most six cycles were included in the study mentioned. For couples who have been waiting longer for a pregnancy, the results cannot simply be transferred. If sperm quality is already limited, an additional factor may carry more weight than in couples without such a history.

When a lubricant makes sense

There are good reasons for using a lubricant. Intercourse by the calendar is exhausting for many couples, and tension often leads to vaginal dryness. If intercourse becomes uncomfortable or painful as a result, that is the greater disadvantage: a couple that misses the fertile day loses more than any lubricant could ever cost.

If you would like to use one, look for osmolality and pH value close to the body's own range – not for the label "for fertility". An advantage of such products over simple lubricants could not be shown in the study mentioned above. Use it sparingly.

Saliva is not a substitute. It impairs sperm motility more markedly than most commercially available lubricants.

Do talk to us if vaginal dryness is a lasting issue. It can have hormonal causes that can be treated – then the lubricant is not the answer but the symptom.

Sources: McInerney KA et al. Lubricant use during intercourse and time to pregnancy: a prospective cohort study. BJOG 2018;125:1541–1548. – Dal Molin EA, Leite GAA, Lazzari VM. A systematic review focused on lubricant use and sperm quality. J Appl Toxicol 2024;44:1470–1477.