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Rain Serum ยท 30 ml

A niacinamide serum for humid days.

Water-light, with 5% niacinamide, rice ferment and licorice root. It sinks in quickly, keeps shine down through a sticky afternoon and sits cleanly under sunscreen.

Shop the serum See what is inside
  • 5% niacinamide
  • No added fragrance
  • For oily and combination skin
Kaarvi Rain Serum in an amber glass dropper bottle, standing in morning sun beside a natural sponge
The amber bottle on a white table, its long shadow falling across the morning light

Why it exists

Made for the hour your skin turns shiny.

In a humid city, skin can feel clean at breakfast and look oily by lunch. Rich creams sit on top of it, and many serums leave a tacky film that the heat only makes worse.

Rain Serum is our answer to that weather. It is a pale gold serum with the feel of water. It sinks in within a minute, dries to a soft, clean finish and stays comfortable from the morning commute to the walk home.

One bottle, made to do one job well.

The glass dropper lifted from the bottle, holding pale gold serum

What is inside

Four ingredients, each with a reason to be there.

  • Niacinamide

    5%

    Vitamin B3. It helps keep shine in check through the day and, with steady use, evens out the look of skin tone.

  • Rice ferment

    Filtrate

    Fermented rice water, long used in Indian and East Asian skincare, for a soft, hydrated feel with no weight.

  • Licorice root

    Extract

    It calms the look of redness and brings light back to dull patches.

  • Panthenol

    Vitamin B5

    It helps skin hold on to water, so it feels comfortable rather than tight.

Left out on purpose: added fragrance, essential oils, drying alcohol and silicones.

Read the full ingredient list

Aqua (water), niacinamide, rice ferment filtrate (sake), glycerin, panthenol, Glycyrrhiza glabra (licorice) root extract, sodium PCA, pentylene glycol, xanthan gum, sodium phytate, phenoxyethanol, ethylhexylglycerin.

How to use

Three drops, twice a day.

  1. On damp skin

    After you wash your face, while it is still a little damp, put three drops in your palm.

  2. Press, do not rub

    Press the serum into your face and neck with flat hands. It sinks in within about a minute.

  3. Then the rest

    In the morning, follow with sunscreen. At night, use it on its own or under a light moisturiser.

New to niacinamide? Use it once a day for the first week, then morning and night.

The open bottle beside its dropper and a piece of dark volcanic stone

Questions

Before you buy.

Who is Rain Serum for?

Oily and combination skin, and anyone whose skin turns shiny in humid weather. If your skin is very dry, follow it with a richer moisturiser.

Can I use it every day?

Yes, morning and night. If niacinamide is new to you, use it once a day for the first week.

Will it sit well under sunscreen and makeup?

Yes. Give it about a minute to sink in, then put on sunscreen and makeup as usual.

Does it have a scent?

There is no added fragrance. Any faint scent comes from the rice ferment.

Can I use it alongside a treatment from my dermatologist?

Ask your dermatologist before adding anything new to a routine they have set for you.

Rain Serum standing on a white table, with the shadows of leaves around it

Shop

Rain Serum

30 ml in an amber glass bottle with a dropper

The amber glass keeps light away from the serum, and the box is plain paper, so both can go in the recycling once the bottle is empty.

Questions first