Tropical Glow | Brightening Serum

The glow you stopped believing in.

Most Vitamin C serums sting, oxidize in the bottle, and disappoint. The culprit is L-Ascorbic acid — the standard form that's unstable and harsh. THD Vitamin C — tetrahexyldecyl ascorbate — is different. Oil-soluble, stable in light, and penetrates three times deeper without irritation. At 10% concentration, sun spots fade. Dullness lifts — leaving clear, luminous skin that brightens with every use.

Liquid Gold.

What it does

Fades sun spots and hyperpigmentation 10% THD Vitamin C is specifically formulated to target existing discoloration and prevent new dark spots from forming — at a concentration that delivers real results without the inflammation of traditional Vitamin C.

Shields against daily damage Acts as a biological defense against UV-induced oxidative stress and environmental pollutants — the invisible daily assault that causes cumulative dullness over time.

Instant radiance, lasting results Broccoli seed oil provides an immediate satin-blurring effect that makes skin look more vibrant from the first application. Over time, the 10% THD Vitamin C builds a clearer, more luminous tone.

Sun-safe brightening Unlike L-Ascorbic acid, THD Vitamin C is stable in sunlight. Wear it in the morning without worrying about UV sensitivity. Brighten during the day, protect during the day — same product.

The scent

You'll notice it the moment you press the drops into your skin. Fresh, clean, subtly tropical — straight from the cold-pressed liliko'i and cucumber oils. It's what cucumber melon always wanted to be.

The Kula standard

• Concentrated formula
• Sensitive skin friendly
• Preservative free
• Fragrance free*

The subtle aroma you'll notice is from the active botanical oils — not added fragrance.

Key ingredients

10% THD Vitamin C (tetrahexyldecyl ascorbate) — Oil-soluble, stable, and non-irritating. Penetrates deeper and stays active longer than standard Vitamin C. Professional-grade brightening that actually delivers.

Organic liliko'i (passion fruit) oil — Naturally high in Vitamin C and essential fatty acids. Brightening, nourishing, and paired with cucumber the source of that fresh, sweet tropical scent.

Hawai'i-harvested macadamia oil — A regenerative lipid that helps actives penetrate deeper while nourishing the skin beneath.

Broccoli seed oil — Rich in natural Vitamin A and fatty acids. Provides the immediate satin-blurring finish that makes skin look smoother and more radiant from application one.

Cucumber oil — Cooling and nourishing. Paired with liliko'i, it's the source of that fresh, subtly tropical scent.

Full ingredient list

Transparency is our standard. Liliko'i (passion fruit) oil*, tetrahexyldecyl ascorbate (vitamin C), macadamia oil**, cucumber oil, broccoli oil, vitamin E. *Organic · **Hawai'i Harvested

The Kula Ritual

Press 3–5 drops into clean, damp skin using your palms. The warmth of your hands helps the active oils absorb more deeply. Use morning and/or night. Always seal with a Kula Essentials balm — Jet Set in the morning, Midnight Magic at night — to lock in the brightening actives. Apply SPF during the day.

This serum is most effective when applied as the first layer after cleansing, before any balm or moisturizer.

Pairs with

•  Jet Set (morning: Tropical Glow first, seal with Jet Set + SPF) 

•  Midnight Magic (night: Tropical Glow first, seal with Midnight Magic) 

•  Island Refresh (alternate mornings, or layer both for maximum brightening and resurfacing)