Np.Miranda's tretinoin advice gets checked by science

What did @np.miranda actually say?

The core argument here is that tretinoin cream contains isopropyl myristate, rates it a five out of five on the comedogenic scale, and concludes it will make your acne worse. The recommendation is to skip the cream entirely and go straight to gel, just at a lower concentration. That's a tidy narrative. Let's see if it holds up.

The creator also frames the "purge" as something prescribers dismiss too quickly, suggesting that when acne worsens on tretinoin, the vehicle, meaning cream versus gel, is more likely to blame than the drug itself. That's a meaningful clinical claim, and it deserves scrutiny rather than a nod.

Does the science back this up?

Partially, but the comedogenicity claim is shakier than the video implies. Isopropyl myristate does appear on several comedogenicity lists, often rated highly. But here's the problem: those ratings largely come from rabbit ear assays conducted in the 1970s and 1980s, not from controlled human skin studies. A 2018 review by Draelos in the Journal of Cosmetic Dermatology noted that comedogenicity testing methods are inconsistent and that ingredient-level ratings don't reliably predict product-level pore-clogging in humans.

The gel-versus-cream distinction is real and clinically relevant. Tretinoin gel does have higher bioavailability than the cream formulation at equivalent concentrations, which is well-documented. A 1995 study by Nyirady et al. in Cutis confirmed gel delivers more active drug per unit time. But "more delivery" also means "more irritation," which is exactly why dermatologists sometimes start patients on cream intentionally. Recommending gel universally as the safer acne option flips that logic on its head.

What did they get wrong (or right)?

Credit where it's due: the historical framing is roughly accurate. Tretinoin was originally developed as a gel by Kligman and Fulton in the late 1960s, and cream formulations did emerge partly in response to tolerability concerns. That part checks out.

What doesn't check out cleanly is the assertion that isopropyl myristate is definitively a five out of five comedogen that "is just gonna break you out." That's presented as settled fact. It isn't. The comedogenic scale the creator is referencing has real methodological baggage. Actual formulated tretinoin cream products have been used in decades of clinical trials on acne patients without isopropyl myristate being flagged as a confounding variable causing worse outcomes.

• The comedogenic ratings she cites are based on outdated animal models, not controlled human trials.
• Tretinoin cream has decades of clinical evidence supporting its use in acne, which the video doesn't acknowledge.
• The claim that cream "is just gonna break you out more" overstates what the evidence supports.

The video also doesn't mention that a worsening purge might simply be the retinoid mechanism itself, not the vehicle.

What should you actually know?

If you're starting tretinoin, the vehicle choice matters, but not in the black-and-white way this video suggests. Gel formulations are generally better suited to oily, acne-prone skin because they're lighter and less occlusive. Cream formulations are often preferred for dry or sensitive skin because the emollient base reduces irritation. Neither is universally better for acne outcomes.

The "purge" is a real phenomenon driven by tretinoin accelerating skin cell turnover and bringing comedones to the surface faster. It typically lasts four to eight weeks. A 2021 review by Zasada and Budzisz in Dermatology and Therapy confirmed this is a pharmacological effect of retinoids, not a product formulation issue.

If your acne is genuinely worsening beyond the expected purge window, that's a conversation to have with whoever prescribed it, because the answer might be concentration adjustment, frequency changes, or reassessing whether tretinoin is the right option for your skin type. Don't make that call based on a TikTok about isopropyl myristate.

Bottom line

This video raises a legitimate point about vehicle differences but oversimplifies it into a rule that could steer people away from a formulation that might actually work better for their skin type. The comedogenicity claim is based on an outdated testing model. The recommendation to universally prefer gel is not supported by current evidence and ignores tolerability trade-offs that clinicians weigh deliberately.