Round Lab Soybean Nourishing Serum: Fermented Soymilk and Vitamin B Routine Guide
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Fermented ingredients are everywhere in Korean skincare, and soy is one of the most familiar. Round Lab's Soybean Nourishing Serum builds its formula around a soymilk ferment and a group of B vitamins. If you are wondering whether it belongs in your routine, here is a plain walkthrough based only on what Round Lab publishes about it.
What Round Lab says about it
According to Round Lab, this is a nourishing serum containing seven types of vitamin B ingredients, obtained by fermenting lactobacillus derived from soymilk, together with soymilk fermentation filtrate. The brand says the goal is to leave skin looking lively and feeling moist.
- Soymilk ferment: the base of the formula, made with lactobacillus taken from soymilk, according to Round Lab.
- Vitamin B group: seven types, which the brand presents as the source of the serum's nourishing feel.
- Texture: described by Round Lab as slightly oily and watery, a sort of in-between texture that is neither a thick oil nor a plain water.
The serum belongs to Round Lab's Soybean range, built around black soybean and nourishing care, and it sits beside the Soybean Nourishing Toner and Soybean Nourishing Cream in that line.
Where it fits in a routine
A typical K-beauty order runs cleanse → toner → serum → cream → sunscreen, and this product goes in the serum slot, after toner and before your moisturizer.
- Morning: gentle cleanser, toner, a small amount of serum, a light cream, then sunscreen as the final step.
- Night: cleanse (double cleanse if you wore sunscreen or makeup), toner, serum, then a richer cream.
Because Round Lab calls the texture slightly oily, a few drops are a sensible start. Let it settle for a minute before your cream so the layers do not pill. If you already use a heavy oil or facial oil at night, you may not need both.
Who it might suit
Going by Round Lab's description, the serum is aimed at people who want a moist, nourishing step, so it reads as a better fit for normal to dry skin, or for anyone whose skin feels tight in colder months. If your skin gets shiny easily, the slightly oily texture is worth keeping in mind; you might use it only at night, or in a thinner layer.
For K-pop fans who keep hearing about fermented skincare on idol vlogs and in K-beauty haul videos, this is a fairly simple way to try a soy-based ferment without a long ingredient learning curve.
What to check before you buy
- Price: listed at $21.70 on Round Lab's US store at the time of writing. Prices and promotions change, so please confirm the current price on the brand page.
- Shipping: check whether Round Lab's US store ships to your country and what shipping and import fees apply.
- Size and full ingredients: confirm the bottle size and read the full ingredient list on the product page, especially if you avoid soy or specific ingredients.
- Patch test: try a small amount on your inner arm or jawline for a day or two before using it on your whole face, as with any new product.
Our take
The Soybean Nourishing Serum is an easy-to-understand pick: a soymilk ferment, a set of B vitamins, and a texture Round Lab describes as slightly oily and watery. It looks most at home in a routine for skin that wants extra moisture, layered between toner and cream. We have not tried it ourselves, so read the brand page carefully, patch test, and see how it sits with the cream you already use.
See Soybean Nourishing Serum at Round Lab →
Information is based on Round Lab's product page as collected by KPOPORO. Details can change; please confirm on the brand page before buying.