KINS Booster II

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KINS BOOSTER II - 50ml

Renewal KINS BOOSTER II is an advanced Japanese skincare booster designed to prepare the skin for the rest of your routine while improving hydration, radiance, and overall skin condition. Applied immediately after cleansing, this lightweight booster helps replenish moisture, gently refine texture, and support a healthier-looking complexion.

The microbiome-focused formula combines fermented ingredients rich in amino acids and peptides with exfoliating and antioxidant ingredients that help smooth roughness, brighten dull skin, and improve elasticity. Its hydrating texture absorbs quickly into the skin, helping subsequent skincare products penetrate more effectively.

Ideal for normal, oily, and combination skin types, KINS BOOSTER II helps restore balance while leaving the skin soft, fresh, luminous, and revitalized.

Key Benefits:

  • Deeply hydrates and replenishes moisture levels.
  • Gently exfoliates for smoother and brighter skin.
  • Helps improve skin elasticity and firmness.
  • Supports healthy skin balance with fermented ingredients.
  • Enhances the absorption of following skincare products. 

Key Ingredients:

  • Lactobacillus Acidophilus / Soy Milk Fermentation Liquid.
    Rich in peptides and amino acids that help moisturize, improve skin softness, and support healthy skin balance.
  • Saccharomyces Cerevisiae Extract.
    Fermented yeast extract rich in amino acids, vitamins, and peptides that deeply hydrates and conditions the skin.
  • Rice Fermentation Liquid.
    Helps maintain hydration, protect against dryness, and support smoother, radiant-looking skin.
  • Hyaluronic Acid.
    Provides deep hydration and helps plump the skin for a smoother appearance.
  • Glycolic Acid & Vitamin C.
    Help gently exfoliate dead skin cells, brighten dullness, and provide antioxidant protection against environmental stress.

How to Use:

  • Use immediately after cleansing.
  • Apply 1 pump in the morning and 2 pumps at night.
  • Gently spread across the entire face using your palms.
  • Follow with serum and moisturizer.
  • Use morning and evening for best results.

Sustainability / Ethical Commitments:

  • Free from parabens.
  • Free from sulfates.
  • Free from artificial fragrances.
  • Free from synthetic dyes.
  • Cruelty-free formulation.

Certifications / Clinical Studies:

  • Microbiome-focused skincare technology.
  • Formulated to support hydration, texture refinement, and skin barrier care.
  • Suitable for normal, oily, and combination skin types.

FAQ:

・What is a booster and where does it fit in my routine?
A booster is applied immediately after cleansing to hydrate the skin and improve absorption of the skincare products applied afterward.

・Is this suitable for sensitive skin?
The formula is free from parabens, sulfates, artificial fragrances, and synthetic dyes, making it suitable for many skin types. Patch testing is recommended for sensitive skin.

・Can I use this every day?
Yes. It is designed for daily morning and evening use.

・Does this help with dull or uneven skin tone?
Yes. Glycolic acid and vitamin C help improve brightness and smoothness for a more radiant complexion.

・Are there any allergens to be aware of?
Some ingredients are derived from soybeans. Those with soy allergies should consult a healthcare professional before use.

We ship internationally from our warehouse here in Tokyo. We use the services of third-party delivery service providers, namely, Japan Post (EMS) and Airmail, for shipping all the orders placed by our customers. View our entire policy here.

Every skin is different, therefore, no returns are accepted simply on the account that the product had an adverse reaction on your skin, or did not provide you any particular kind of results that you were expecting. However, you may initiate a return for the defective and damaged products purchased from the website within a period of7 (seven) days calculated from the order delivery date (“Return Period”). View our entire policy here.

Water, (Bifidobacterium / Enterococcus (Durans / Faecalis / Faecium) / Lactobacillus / Lactococcus / Pediococcus) / fermented soybean seed extract, Lactobacillus / fermented soy milk, lemon fruit water, BG, Lactobacillus, Lactobacillus / fermented soy milk, rice fermentation extract, Saccharomyces cerevisiae extract, Polymnia sonchifolia root juice, α-glucan oligosaccharide, Polyquaternium-51, aspartic acid, arginine, hydroxypropyl methylcellulose, maltodextrin, grapefruit seed extract, PEG/PPG/polybutylene glycol-8/5/3 glycerin, sodium citrate, glycerin.

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We only use express delivery to make sure you get your skincare goodies in the shortest time possible.


Unlike generic beauty retailers, Beauty Ninja carefully curates only the most advanced and luxurious Japanese skincare. Every product is tested and approved for its effectiveness.

Have a question?

See some of our common FAQS below

Yes! We source all products directly from Japanese brands, ensuring 100% authenticity.

In Japan, expiration dates are usually not printed on cosmetics unless required (e.g., food or medicated products). However, we keep small stocks and order directly from manufacturers to ensure you get the freshest products. Most items have a shelf life of 2–3 years when stored properly in a cool, dry place away from direct sunlight.

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Orders ship within 1–5 business days (we often order directly from manufacturers to ensure freshness). Once shipped, delivery takes 5–10 days, but times may vary due to customs or other delays.

  • Free for orders over $250 USD
  • Flat rate $15 USD for all other orders.

We ship to over 60 countries, including the USA, UK, Australia, Canada, and most of Europe and Asia. See our shipping page for the full list.

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