Dimethicone vs zinc oxide: which should you choose?

What is the difference?

Which should you choose?

Choose a product for the job you need done, because 'versus' gives an ingredient list more drama than it deserves. A dimethicone barrier cream is worth considering if a less greasy finish matters. For moisture exposure, zinc oxide creams and ointments form a protective barrier. Neither ingredient has a clear universal advantage for adult skin irritation caused by incontinence, meaning leakage of urine or stool. Performance depends on the complete formula and how much is applied.135

You can also choose a formula containing both. DynaShield with Dimethicone is labelled to help treat and prevent diaper rash, seal out wetness, and temporarily protect and relieve chafed or cracked skin. Its percentages describe that cream, not a strength target for every barrier product.4

How do you use a barrier cream?

For skin exposed to urine or stool:

1. 1Clean the area promptly after each episode. A soap free cleanser is an option; follow its rinsing instructions.
2. 2Gently pat the skin dry before applying the barrier product.
3. 3Apply the cream or ointment as directed. General barrier creams are applied sparingly, but DynaShield directs liberal application for diaper rash.
4. 4Reapply after cleaning and drying. For diaper rash, DynaShield directs application with each diaper change, especially at bedtime or before prolonged wet diaper exposure.

Barrier creams can persist for several hours, including after gentle washing. For incontinence care, cleaning after every episode remains necessary, even when a protective cream is used. The barrier handles protection, not housekeeping, which is an unusually clear division of labour for skincare.13

What if you mean sunscreen?

Choose a sunscreen with a labelled SPF and broad spectrum protection, not a diaper cream simply because it contains zinc oxide. SPF mainly describes protection against UVB, while broad spectrum protection includes UVA. Mineral filters protect primarily by absorbing ultraviolet radiation, rather than acting only as reflective shields. Smaller zinc oxide particles reduce white residue and improve application. Apply sunscreen before going out and reapply every two hours; daily use is advised when the forecast UV index reaches 3 or higher.2

Who should be careful?

Barrier creams are usually well tolerated, but fragrances, preservatives or other ingredients can cause an allergic skin reaction. Some occlusive creams can aggravate facial acne, and most should not be applied directly to broken skin. Zinc oxide can also cause local irritation or an allergic reaction in people sensitive to it.16

For DynaShield, stop use and ask a doctor if the condition worsens, lasts more than seven days, or clears and returns within a few days. Its label also directs pregnant or breastfeeding users to ask a health professional before use. Severe irritation during incontinence care needs medical attention. Keep these products out of children's reach; if swallowed, seek medical help or contact poison control immediately.34