B12 BASE THINNER Vitamin Pearl Serum: Review & Makeup Prep Benefits
By ONE/SIZE by Patrick Starrr | Published: 2026-08-06
Category: Product Reviews
Discover how ONE/SIZE's B12 BASE THINNER Vitamin Pearl Serum preps skin for flawless makeup, with our full review and application tips.
If you’re someone who loves makeup, you know that the key to a flawless finish isn’t just the foundation or concealer—it’s what you put underneath. A good makeup prep serum can transform how your base looks and lasts, and that’s exactly where the B12 BASE THINNER Vitamin Pearl Serum from ONE/SIZE by Patrick Starrr comes in. This innovative serum has been creating buzz in the beauty community, and we’re here to break down everything you need to know.

In this review, we’ll dive into what makes this vitamin pearl serum special, how to incorporate it into your routine, and why it might just become your new holy grail for makeup prep. Whether you have dry patches, enlarged pores, or just want your foundation to look like skin, this serum promises to deliver. Let’s get into it.
What is the B12 BASE THINNER Vitamin Pearl Serum?
The B12 BASE THINNER Vitamin Pearl Serum is a skincare-makeup hybrid designed specifically for makeup prep. Formulated with vitamin B12 and pearl extract, this serum aims to hydrate, brighten, and smooth the skin’s surface, creating the perfect canvas for foundation. The lightweight, gel-like texture absorbs quickly, leaving a soft, velvety finish that helps makeup glide on seamlessly.
Unlike traditional skincare serums that focus solely on long-term skin health, this one is engineered to deliver immediate benefits that you can see and feel under makeup. It helps to minimize the appearance of pores and fine lines, so your base looks airbrushed rather than cakey. Plus, the vitamin B12 and pearl infusion gives your skin a subtle radiance that shines through your foundation for a healthy, lit-from-within glow.
- Key ingredients: Vitamin B12 and pearl extract for brightening and hydration.
- Texture: Lightweight, fast-absorbing gel that leaves no residue.
- Finish: Soft-focus effect that blurs imperfections and preps skin for makeup.
How to Use B12 BASE THINNER for Best Results
To get the most out of this vitamin pearl serum, apply it after cleansing and toning, but before your moisturizer and primer. A little goes a long way—just a few drops are enough to cover your entire face. Gently press the serum into your skin with your fingertips, focusing on areas where you tend to get dry or where your makeup tends to fade. Allow it to absorb for about a minute before moving on to the next step.
For an extra boost, you can mix a drop of the serum with your foundation or concealer to create a more luminous, skin-like finish. This is especially helpful if you’re using a matte foundation and want to avoid a flat look. The serum helps to thin out the product, making it easier to blend and less likely to settle into fine lines. It also adds a touch of hydration, which can prevent your base from looking cakey throughout the day.
- Apply on damp skin right after cleansing for maximum absorption.
- Use before your primer to create a smooth, hydrated base.
- Mix with foundation for a dewy, skin-like finish.
Benefits of Using a Makeup Prep Serum
You might be wondering, 'Why add another step to my routine?' The answer is simple: makeup prep serums like the B12 BASE THINNER can make a huge difference in how your makeup looks and lasts. By hydrating the skin and creating a smooth surface, these serums help your foundation apply more evenly and stay put longer. They also prevent your makeup from clinging to dry patches or emphasizing texture.
Additionally, the brightening properties of vitamin B12 and pearl extract can help reduce the appearance of dullness, so your skin looks more awake and radiant even before you apply makeup. This is particularly beneficial for those with tired-looking skin or uneven skin tone. When you prep with a serum like this, you’re not just improving your makeup application—you’re also nourishing your skin over time.
- Hydrates and plumps the skin, reducing the look of fine lines.
- Creates a smooth, even canvas for foundation and concealer.
- Helps makeup last longer and prevents midday touch-ups.
Pairing with Other ONE/SIZE Products
To build a complete makeup prep routine, consider pairing the B12 BASE THINNER serum with other ONE/SIZE favorites. After applying the serum, lock in hydration with a setting spray like the On 'Til Dawn Bronze Veil Waterproof Setting Spray, which not only sets your makeup but also adds a natural bronze glow. For those who struggle with oiliness, the On 'Til Dawn Mattifying Waterproof Setting Spray Jumbo is a great option to keep shine at bay all day.
When it comes to application, the Ultimate Kite Puff Precision Puff Set is perfect for pressing in your foundation or setting powder for a flawless, airbrushed finish. And don’t forget to finish with the Ultimate Blurring Setting Powder to bake and blur any areas where you want extra longevity. These products work together to ensure your makeup stays put from morning to night.
- Use with On 'Til Dawn Bronze Veil Waterproof Setting Spray for a bronzed glow.
- Pair with On 'Til Dawn Mattifying Waterproof Setting Spray Jumbo for oil control.
- Apply with Ultimate Kite Puff Precision Puff Set for a seamless finish.
The B12 BASE THINNER Vitamin Pearl Serum is a game-changer for anyone who wants their makeup to look its best. Its hydrating, brightening formula creates the perfect canvas, making foundation application easier and more long-lasting. Whether you’re a makeup novice or a pro, this serum is worth adding to your routine. Ready to elevate your makeup prep? Explore the B12 BASE THINNER Vitamin Pearl Serum and see the difference for yourself.


