Comparison

Attivi Puri Vitamin C + Ferulic Acid Drops vs Skin Regimen 1.5 Retinol Booster

Name: Skin Regimen 1.5 Retinol Booster
Brand: Comfort Zone
Price: 98 USD

Collistar vs Comfort Zone — side by side, no bias.

Collistar

Attivi Puri Vitamin C + Ferulic Acid Drops

8.2/10serum

Comfort Zone

Skin Regimen 1.5 Retinol Booster

8.8/10serum

Our pick

Skin Regimen 1.5 Retinol Booster

8.8/10 · Comfort Zone

	Attivi Puri Vitamin C + Ferulic Acid Drops	Skin Regimen 1.5 Retinol Booster
Brand	Collistar	Comfort Zone
Category	serum	serum
Editor Rating	8.2/10	8.8/10 ★
Category	serum	serum
Texture	Drops/oil hybrid	Concentrated oil-serum drops
Finish	Brightened, glow	Smooth, refined, renewed
Skin Types	Combination	Combination Mature
Targets	Dullness Hyperpigmentation Fine Lines	Fine Lines Dullness Hyperpigmentation
Pros	+15% L-AA + ferulic acid is a credible clone of SkinCeuticals +airless packaging preserves stability +€38 is significantly below SkinCeuticals +fragrance-free	+1.5% pure retinol — higher than most consumer products, spa-professional grade +squalane base stabilizes retinol while providing hydration to offset drying +booster format allows flexible dosing — start low, build up gradually +25ml lasts 3–4 months at 2–3 drops per night — cost-per-use is reasonable
Cons	−propylene glycol high in deck −vitamin C drops format slightly unusual −stable for 90 days — short shelf life	−1.5% retinol is too strong for retinol beginners — start with 0.3–0.5% first −~$98 is premium pricing even for a clinical-grade retinol −the oil-serum texture may not suit oily skin types −mandatory sunscreen with retinol use — non-negotiable at this concentration
Verdict	Collistar's L-ascorbic + ferulic acid drops — the Italian-pharmacy Skinceuticals C E Ferulic alternative at less than half the price. 15% L-AA + ferulic acid + vitamin E in airless dropper packaging. The Attivi Puri 'drops' format is Collistar's clinical-active line.	Comfort Zone's most potent active — a 1.5% pure retinol booster in a squalane base that professionals use as the heavy-hitter in spa anti-aging protocols. The concentration is serious: 1.5% retinol is higher than most consumer retinol products (The Ordinary's strongest is 1%) and sits in the territory typically reserved for dermatologist-dispensed products. The squalane carrier serves a dual purpose — stabilizing the retinol against oxidation while providing emollient hydration that offsets retinol's drying effect. Rosemary extract and vitamin E add antioxidant protection. The 'booster' format means 2–3 drops mixed into your existing moisturizer or serum, which gives flexible dosing: start with one drop every other night, build to three drops nightly. At ~€88 (~$98) for 25ml, it's premium — but the concentration means a bottle lasts 3–4 months of nightly use. This is the product that spa therapists reach for when clients are ready to graduate from retinol alternatives to the real thing.

Ingredient Breakdown

Attivi Puri Vitamin C + Ferulic Acid Drops

Skin Regimen 1.5 Retinol Booster

Brand

Collistar

Comfort Zone

Category

serum

Texture

Drops/oil hybrid

Concentrated oil-serum drops

Finish

Brightened, glow

Smooth, refined, renewed

Skin Types

Combination

Combination Mature

Targets

Dullness Hyperpigmentation Fine Lines

Fine Lines Dullness Hyperpigmentation

Pros

+15% L-AA + ferulic acid is a credible clone of SkinCeuticals
+airless packaging preserves stability
+€38 is significantly below SkinCeuticals
+fragrance-free

+1.5% pure retinol — higher than most consumer products, spa-professional grade
+squalane base stabilizes retinol while providing hydration to offset drying
+booster format allows flexible dosing — start low, build up gradually
+25ml lasts 3–4 months at 2–3 drops per night — cost-per-use is reasonable

Cons

−propylene glycol high in deck
−vitamin C drops format slightly unusual
−stable for 90 days — short shelf life

−1.5% retinol is too strong for retinol beginners — start with 0.3–0.5% first
−~$98 is premium pricing even for a clinical-grade retinol
−the oil-serum texture may not suit oily skin types
−mandatory sunscreen with retinol use — non-negotiable at this concentration

Verdict

Collistar's L-ascorbic + ferulic acid drops — the Italian-pharmacy Skinceuticals C E Ferulic alternative at less than half the price. 15% L-AA + ferulic acid + vitamin E in airless dropper packaging. The Attivi Puri 'drops' format is Collistar's clinical-active line.

Comfort Zone's most potent active — a 1.5% pure retinol booster in a squalane base that professionals use as the heavy-hitter in spa anti-aging protocols. The concentration is serious: 1.5% retinol is higher than most consumer retinol products (The Ordinary's strongest is 1%) and sits in the territory typically reserved for dermatologist-dispensed products. The squalane carrier serves a dual purpose — stabilizing the retinol against oxidation while providing emollient hydration that offsets retinol's drying effect. Rosemary extract and vitamin E add antioxidant protection. The 'booster' format means 2–3 drops mixed into your existing moisturizer or serum, which gives flexible dosing: start with one drop every other night, build to three drops nightly. At ~€88 (~$98) for 25ml, it's premium — but the concentration means a bottle lasts 3–4 months of nightly use. This is the product that spa therapists reach for when clients are ready to graduate from retinol alternatives to the real thing.

Attivi Puri Vitamin C + Ferulic Acid Drops vs Skin Regimen 1.5 Retinol Booster

Attivi Puri Vitamin C + Ferulic Acid Drops

Skin Regimen 1.5 Retinol Booster

Ingredient Breakdown

Shared Ingredients

Only in Attivi Puri Vitamin C + Ferulic Acid Drops

Only in Skin Regimen 1.5 Retinol Booster

Attivi Puri Vitamin C + Ferulic Acid Drops vs Skin Regimen 1.5 Retinol Booster

Attivi Puri Vitamin C + Ferulic Acid Drops

Skin Regimen 1.5 Retinol Booster

Ingredient Breakdown

Shared Ingredients

Only in Attivi Puri Vitamin C + Ferulic Acid Drops

Only in Skin Regimen 1.5 Retinol Booster