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A Dedicated Space for Certified Stylists
Designed for stylists who demand excellence and choose luxury without compromise.
Addendum defines the modern professional standard in extensions, now elevated with a personalized approach for every stylist.
YOUR DAILY DOSE OF LUXERY
DOUBLE SHOT LEAVE-IN CONDITIONER
Addendum's multifaceted Leave-In Conditioner gives new life to hair with nourishing ingredients that instantly moisturize, smooth, and prime each cuticle for long-lasting style.
Discover the story behind every strand
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Meet Double Shot
The Leave-In Cocktail
A leave-in conditioner so good, the whole family will want it. Powered by a proprietary blend of jojoba, coconut, and silk, Double Shot is strong enough to tame the fiercest frizz yet gentle enough for daily wear. It’s not just a product; it’s a shield for your investment.
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