The short answer

Choose the serum that matches the question you are asking, not all three. REGLOW (Dark Spot Solution Vita C TRX Serum) is for visible dark spots and uneven-looking tone, REWIND (Firming Bakuchiol PDRN Serum) is for skin that looks less firm, and REFINE (Jeju Yuja Succinic Balancing Serum) is for skin that gets oily and congested. Start with one, patch-test it, use 2–3 drops, and add a second only when the first feels comfortable.

The three serums side by side

All three are 30 ml dropper bottles on a plant-water base instead of purified water, and each carries one headline ingredient at an amount printed on the label. They differ in what they are built around.

REGLOW
Vita C TRX		 REWIND
Bakuchiol PDRN		 REFINE
Succinic
For Visible dark spots, uneven-looking tone; brightening Skin that looks less firm; firmness and elasticity Oily, congested-looking skin; skin prone to breakouts; soothing, skin barrier, texture care
Headline ingredient Tranexamic acid 3% (30,000 ppm) Bakuchiol 1% (10,000 ppm) and 2% (20,000 ppm) of a patented vegan PDRN complex Succinic acid 2% (20,000 ppm) and niacinamide 2% (20,000 ppm)
Base 72% sea buckthorn water 60% aloe leaf water 60% bamboo water
Also in it Niacinamide 2% with alpha-bisabolol 0.5%, MELAWAY complex 1% Adenosine and niacinamide, peptides, ceramide Citric acid (AHA) and zinc PCA, 2,800 ppm combined, plus gluconolactone (PHA)
Patch-test note Jawline, two nights, if sensitive Jawline, two nights; start every other night if sensitive Jawline, two nights; start every other day
Directions 2–3 drops, morning and evening Shake first; 2–3 drops, morning and evening 2–3 drops, morning and evening

The amounts matter less than what each one is for. If you want to know how to read “ppm”, keep in mind that 10,000 ppm is 1%, so the table's ppm and percentage figures are the same amounts written two ways.

Hands taking small serum bottles from a travel pouch on a bed
Serums are small and easy to carry; the order and amounts are the same wherever you apply them.

Where the serums sit among the three lines

VVBETTER arranges its skincare into three lines with different jobs. The Blue Line is base skincare for dry, sensitive or dehydrated skin, and its serum is Teca Lifting Moisture Serum (8 types of peptides, hyaluronic acid and centella asiatica), the daily hydration step. The Purple Line is extra skincare for firmness, elasticity and regeneration. The Green Line, Jeju Yuja, purifies and balances oily, combination or sensitive skin. The three Solution serums are targeted steps you add on top of a base: REFINE is the Green Line's balancing serum, REWIND shares the Purple Line's focus on firmness and elasticity, and REGLOW is the brightening one. If your skin mostly needs hydration, the Blue Line serum is the first one to consider, before any of the three.

How to decide which one to start with

Ask which visible thing you most want to look after, then pick the serum written for it.

If it is dark spots or an uneven-looking tone

REGLOW is the brightening serum. It is aimed at visible dark spots and tone that looks uneven, and is meant to help visibly brighten the look of both. Its headline active is tranexamic acid at 3%, and the base is 72% sea buckthorn water (the 72% is the water base, not vitamin C). The maker advises against using it with strong acid products such as AHA or BHA toners, which matters if you already use one.

If it is skin that looks less firm

REWIND is built for this, with firmness and elasticity as its focus. Bakuchiol is a plant-derived ingredient used in place of retinol, at 1%, and it sits with a 2% vegan PDRN complex on an aloe water base. Shake the bottle before use, because it contains natural colorants that can separate. That is covered in shake, then take your moment.

If it is oiliness, texture and congested-looking skin

REFINE pairs 2% succinic acid with 2% niacinamide and low levels of citric acid and gluconolactone. It belongs to the Jeju Yuja Green Line and is aimed at soothing, supporting the skin barrier and texture care as well as balance. Because it contains acids, patch-test, start every other day if your skin is sensitive, and use sunscreen in the morning.

If none of these sounds like you, or you are unsure, the skin quiz is a faster starting point than comparing labels, and compare serums sets the three out in a single table.

A drop falling from a dropper above an open brown bottle labelled Dark Spot Solution Vita C TRX Serum
REGLOW, the Vita C TRX Serum, in its brown glass dropper bottle.

How to start with one serum

Choosing one serum and giving it a week of attention is mindful skincare in practice: you learn what it does before you add the next thing.

  1. Patch-test first. Put a little on the jawline for two nights. Stop if you see redness, swelling or itching.
  2. Cleanse and tone. Apply the serum to clean skin after any toner or pad.
  3. Use the dropper. Squeeze the rubber bulb to draw the serum up, place a drop on the forehead and on each cheek (2–3 drops in all), then press gently over the face until absorbed. A dropper serum is not a pump; more drops is not better.
  4. Follow with a moisturizer. A serum is not a replacement for cream.
  5. Finish with sunscreen in the morning. Daily Airfit Sunscreen is not offered in the United States, so use a sunscreen you already like.
  6. Keep notes for a week. Then decide whether to keep going, change the frequency or add something. The first-week guide gives a plan.
A drop falling from a dropper above an open lavender bottle labelled Firming Bakuchiol PDRN Serum
REWIND, the Bakuchiol PDRN Serum, a lavender bottle that you shake before use.
A green dropper bottle of Jeju Yuja Succinic Balancing Serum lying in a pool of green serum
REFINE, the Succinic Balancing Serum, in a green dropper bottle.

If you want to use two or three together

You do not have to. If you choose to, the label order is Succinic first, then Vita C TRX, then Bakuchiol PDRN, each at 2–3 drops, followed by sunscreen in the morning. Introduce them one at a time rather than all at once.

Very sensitive or thin skin is directed to use one serum per routine instead of all three. For example, you could use Succinic in the morning and Vita C TRX or Bakuchiol PDRN at night. If your skin feels tight, hot or itchy, drop back to a single serum, and if you see redness, swelling or itching, stop and consult a clinician or skin specialist.

The Succinic Balancing Serum and the Vita C TRX Serum can leave a little harmless white powder around the dropper opening. It comes from the ingredient meeting air and is not a defect.

Quick answers

Can I use all three serums from the first day?

You can layer them in the label order if your skin is comfortable with each, but starting all three at once makes it impossible to tell which one caused a problem. Start with one, and add the next later.

Which serum is best for sensitive skin?

We do not rank them, because sensitivity is personal. All three completed a skin low-irritation test, and a test is not a guarantee for every skin, so patch-test and start gently. REFINE and REWIND include notes to start every other day or every other night if your skin is sensitive.

Do I still need a moisturizer?

Yes. A serum is a thin layer; a cream goes on after it. For a pairing, Teca Lifting Moisture Cream is applied in a pea-sized amount.

Where to go next