The Ordinary Amino Acids + B5Amino Acids + B5

The Ordinary The Ordinary Amino Acids + B5 hydration serum for enhanced barrier support
The Ordinary swatch of The Ordinary Amino Acids + B5
The Ordinary Amino Acids + B5

Regimen Step 2: Treat

A hydrating serum.
Price reduced from 10.70 USD to 8.24 USD
Enjoy 23% off for Slowvember. Terms & Conditions apply.

Targets Dryness

Suited to All Skin Types

Format Water-based Serum

Key ingredients
Betaine, Arginine, Panthenol, Sodium PCA, Sodium Lactate, PCA
Price reduced from 10.70 USD to 8.24 USD
Enjoy 23% off for Slowvember. Terms & Conditions apply.
Use code SLOWMPES for a free Multi-Peptide Eye Serum - 15ml with every order.
Plus free shipping until the end of November. Conditions apply.
4.80 - 5.30



In your regimen

  • Prep
  • Step 2: Treat
  • Seal

Use after cleansing, before anhydrous serums, oils, suspensions or creams.


Amino Acids + B5 is an ultra-thin serum that works with your skin to support its natural hydration barrier. By including a concentrated 17% (by weight) solution of amino acids and amino acid derivatives that mimic your skin’s natural moisturizing factors, this water-based formula keeps the outer layer of your skin protected and well-hydrated without feeling greasy. Plus, it uses 5% (by weight) pro-vitamin B5 to provide surface and below-surface hydration, giving way to softer, smoother skin.

How to use

Product Directions
  • Apply a few drops to the face in the morning and evening. 
  • A tingling sensation can be expected after application. 
  • If the sensation is too strong, the formula can be mixed with other creams or serums of your preference before each application to reduce the strength. 
  • If irritation occurs, rinse off, cease use, and consult a physician. Use only as directed on unbroken skin. 
  • Patch testing prior to use is advised. 
  • Keep out of reach of children.

Always patch test before use.

View Customer disposal instructions.

When to use

Use in AM

Use in PM

Good for

12 months after opening.

How to build a skin regimen

Step 1: Prep 3

Cleanse the skin and prepare it to receive active ingredients.

Step 2: Treat 9

Address specific skin concerns using targeted formulas. Always check each product's Usage Details to ensure products are compatible in the same routine.

Step 3: Seal 3

Lock in benefits and support the skin barrier.


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