Beginner·Explainer·5 min
Serums, creams, oils, gels, and balms
The difference between a serum, a cream, an oil, a gel, and a balm is structural: how much water is present and how the formula holds itself together.
FormulationHow to layer serums
Thin to thick, one change at a time, and fewer than you think.
By HELM Editorial · EditorialUpdated 8/9/2026
Key takeaways
- —Apply lighter, water-based products before heavier ones.
- —Two serums is a reasonable maximum for most routines.
- —Give each layer a moment to settle rather than timing it precisely.
- —If skin stings or flushes, reduce the number of layers before changing brands.
Layering has acquired more ceremony than it deserves. The underlying logic is simple: a heavier, more occlusive product applied first sits between the skin and whatever comes next.
Thin to thick
Apply water-based, lightly thickened products first, then richer emulsions, then anything anhydrous. Let each layer settle for a moment — not because a timer matters, but because applying onto a wet layer tends to pill and waste product.
How many is too many
Two serums covers most reasonable goals. Beyond that, each additional layer adds cost, adds irritation risk, and makes it harder to identify what is responsible for a result.
A workable pattern
- —Cleanse.
- —Optional water-light step such as an essence.
- —Serum one — the product you most care about.
- —Serum two only if it has a distinct job.
- —Moisturiser.
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