How long does tretinoin take to work?

Most people see initial results — smoother texture and fewer breakouts — within 8–12 weeks of consistent nightly use. Significant improvements in fine lines, hyperpigmentation, and skin tone typically appear at the 6-month mark. Full collagen remodeling benefits can take 12–24 months. The purging phase (weeks 2–6) is normal and temporary. Consistency matters more than concentration: a .025% used every night outperforms a .1% used sporadically.

What should you not mix with tretinoin?

Avoid using benzoyl peroxide, AHAs (glycolic acid, lactic acid), BHAs (salicylic acid), or vitamin C serums in the same routine as tretinoin — they can over-exfoliate and compromise the skin barrier. Niacinamide can be used in the same routine but apply it first and wait 20–30 minutes. The safest pairing: tretinoin at night, SPF 30+ every morning (non-negotiable), and a fragrance-free moisturizer.

What is the tretinoin purge and how long does it last?

The tretinoin purge is an initial breakout phase caused by accelerated cell turnover bringing underlying congestion to the surface faster than normal. It typically lasts 4–8 weeks and most commonly affects areas where you normally break out. Signs it is a true purge: new breakouts appear in your usual trouble zones, and they resolve faster than normal pimples. Signs it is an irritation reaction: widespread redness, burning, or cysts in new locations. If purging lasts beyond 12 weeks, reduce frequency or concentration.

tretinoin

Is Biossance 100% Squalane Oil Worth $32?

Biossance Squalane Oil is the clean-beauty favorite — plant-derived 100% squalane. Here's the honest review and whether it's worth it vs The Ordinary's $8.

Last updated April 13, 2026 · 5 min read · First published Apr 2026

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The short answer

Biossance 100% Squalane Oil is worth $32 if you prioritize sugarcane-derived squalane with sustainability certifications and want a premium clean-beauty option. Biossance’s squalane has molecular structure identical to natural skin lipid. Skip if you just want squalane — The Ordinary 100% Plant-Derived Squalane at $8 is molecularly comparable at 25% of the price. Biossance wins on brand, philosophy, and packaging; The Ordinary wins on value.

Squalane is one of the best-tolerated facial oils — molecularly similar to your skin’s natural sebum. Biossance positions itself as the premium squalane option at $32. Here’s the honest breakdown.

What makes squalane special

The short answer

Squalane is a saturated version of squalene (naturally produced by human skin), used in skincare as a moisturizer, barrier support, and lightweight oil. Doesn’t clog pores for most people, doesn’t oxidize quickly, doesn’t irritate. Sources: sugarcane (plant-derived, Biossance), olive oil (The Ordinary), shark liver (legacy source, controversial). Molecular result is nearly identical across sources.

Squalane properties:

Molecularly similar to natural skin sebum
Non-comedogenic for most skin types
Doesn’t oxidize (stable oil)
Sources: sugarcane, olive, shark (controversial)

Biossance vs alternatives

The short answer

Biossance 100% Squalane Oil ($32) vs alternatives: The Ordinary 100% Plant-Derived Squalane ($8) — same molecular structure, olive-derived, 25% of the price. Skin Actives 100% Squalane ($14) — similar plant-derived, mid-tier. For pure squalane, the $8 Ordinary is molecularly equivalent. Biossance premium is for brand positioning, sustainability claims, and packaging.

Comparison:

The Ordinary Plant-Derived Squalane ($8): olive-derived, molecularly equivalent
Skin Actives Squalane ($14): similar plant-derived, mid-tier
Biossance 100% Squalane ($32): sugarcane-derived, premium brand + packaging

Practical difference for most skin: none. Premium difference: philosophy and brand.

When squalane is worth using

The short answer

Squalane (any brand) is genuinely useful for: dry skin layering, tretinoin-irritated skin buffering, makeup preparation prep, facial massage medium, nightly moisturizer boost, post-procedure recovery. Works well for: all skin types including oily (surprisingly non-clogging). Not a replacement for: moisturizer, SPF, actives. Adjunct rather than core product.

Squalane use cases:

Dry skin layer (last step for richer feel)
Tretinoin buffer (apply before or after)
Pre-makeup (smoothing, plumping)
Face massage medium
Post-procedure (gentle support)

Biossance Squalane specific

Premium pick

Biossance

100% Squalane Oil

~$30

100% sugarcane-derived squalane.

Best for: Clean-beauty lovers, sustainability-focused buyers

"Works as well as The Ordinary squalane, at 4x the price."

Check price on Amazon →

The Ordinary alternative

Best value

The Ordinary

100% Plant-Derived Squalane

~$8

Olive-derived squalane. Budget equivalent.

Best for: Budget squalane users

"Molecularly equivalent to Biossance at 25% of the price."

Check price on Amazon →

How to use squalane

Apply to clean or moisturized skin
2-5 drops typically enough for face
Morning or night (no photosensitivity)
With other products: compatible with vitamin C, niacinamide, retinoid
Not a replacement for moisturizer or SPF

Verdict

8/10. Genuinely useful product — but $32 is a brand premium, not a performance premium. If Biossance’s philosophy and packaging matter to you, worth it. If pure squalane with same molecular structure is the goal, The Ordinary at $8 delivers equivalent.

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Frequently asked

Is Biossance squalane really better? +

Sugarcane-derived vs olive-derived — different source, molecularly similar result. On skin, essentially the same effect. Difference is philosophy + packaging.

Will squalane break me out? +

Unlikely for most people — comedogenicity rating is very low (0-1). Some very oily skin reacts, but most skin tolerates squalane well.

Can I use squalane with tretinoin? +

Yes — excellent tretinoin buffer. Apply tretinoin first, wait 20 min, then squalane.

Is squalane vegan? +

Plant-derived versions (Biossance, The Ordinary, Skin Actives) are vegan. Shark-liver sources are not. Check the label.

How long does a bottle last? +

1 oz at 2-5 drops daily = 3-4 months. Biossance: $8-10/month. The Ordinary: $2/month.

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~$295

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Dual-chamber growth factor + peptide serum. Actually worth the splurge.

Buy on Amazon →

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The Cream

TFC8 tech. The one celebrities keep talking about.

Buy on Amazon →

SkinMedica

~$230

TNS Recovery Complex

The original growth-factor serum. Exosome + peptide rejuvenation.

Buy on Amazon →

SkinMedica

~$95

Retinol Complex 1.0

Pharma-grade retinol that feels like a serum, not a sentence.

Buy on Amazon →

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The derm favorite. Zinc + niacinamide, no white cast.

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Goes on like a primer. Zero white cast, zero scent.

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