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Skincare answers, with receipts
The questions everyone asks (purging, layering, slugging, what order things go in), answered from the dermatology literature, with every claim labeled: research-backed, mixed evidence, or convention.
Both free, both about a minute. Or just browse all 18 answers.
Every claim is labeled
research-backed cited, peer-reviewed support
mixed evidence some support, real caveats
convention tradition without trials
The full standard
The reference shelf
Answer-first guides to the questions that fill every skincare thread, checked against sources you can click.
Start here
Skincare Routine Order: What Goes First and Why
The correct skincare routine order, morning and night: cleanse, treat, moisturize, SPF. A step-by-step table, plus which ordering rules are actually evidence-based.
Read the guide
02
Skin Purging or Breaking Out? How to Tell the Difference
How to tell skin purging from a real breakout: which ingredients can cause purging, how long it lasts, and when new spots mean you should stop a product.
03
Double Cleansing: Do You Actually Need It?
What double cleansing is, where the evidence stands, who genuinely benefits from an oil-then-water cleanse, and who is better off with one good cleanser.
04
Slugging: What It Does and Who Should Skip It
Slugging seals your routine under petrolatum overnight. What barrier research actually supports, who benefits, who should skip it, and how to avoid breakouts.
05
Niacinamide and Vitamin C: Can You Use Them Together?
Yes, you can use niacinamide and vitamin C together. Where the incompatibility myth came from, what each ingredient actually does, and how to layer them.
06
How Often Should You Wash Your Face?
Twice a day and after sweating, per dermatology guidance. What changes by skin type, the signs you are over-washing, and whether the morning wash is optional.
07
How Long Does Skincare Take to Work? Honest Timelines
Realistic timelines for moisturizer, niacinamide, vitamin C, retinoids and acne treatment, why the first month is mostly invisible, and how to track change.
08
How Much Sunscreen Do You Need? The Real Numbers
How much sunscreen to apply for your face and body: the two finger rule, the quarter teaspoon rule, why most people apply half the tested dose, and reapplication.
09
Chemical vs Mineral Sunscreen: What Actually Differs
Chemical and mineral sunscreens compared honestly: how each works, the absorption studies, white cast, sensitive skin, and how to actually choose between them.
10
Do Pimple Patches Work? What They Can and Cannot Do
Pimple patches explained honestly: the hydrocolloid evidence, which spots they help, which they cannot touch, microdart patches, and how to use them right.
11
Salicylic Acid vs Benzoyl Peroxide: Which for Your Acne
Salicylic acid and benzoyl peroxide compared: how each works, which acne types each treats best, strengths to buy, how to combine them, and when neither is enough.
12
Does Skincare Expire? Shelf Lives, Honestly
How long skincare actually lasts: PAO symbols, expiration dates, which products go off fastest, the signs a product has turned, and what expired products really risk.
13
Beef Tallow for Skin: What the Evidence Actually Says
Beef tallow skincare examined honestly: what a 2024 scoping review found, the moisturizer logic, the acne risk, and who might reasonably try it or skip it.
14
Snail Mucin for Skin: Hype, Evidence and Who It Suits
What snail mucin actually is, what small clinical studies show, what remains marketing, whether it is cruelty-relevant, and who should try or skip it.
15
Retinal vs Retinol: The Difference That Actually Matters
Retinal (retinaldehyde) versus retinol, explained: the conversion chain, what trials show about speed and irritation, who should choose which, and how to start.
16
Does Collagen Work? Creams, Powders and the Evidence
Collagen creams versus collagen supplements, judged honestly: what a systematic review found, the absorption problem, marketing tricks, and what actually builds collagen.
17
Red Light Therapy at Home: What LED Masks Really Do
At-home red light therapy examined: the controlled-trial evidence, how LED masks compare to clinic panels, realistic timelines, safety, and who should skip it.
18
Skincare Myths: What the Evidence Actually Says
Common skincare myths checked against dermatology sources: pores opening, chemical-free claims, drinking water, purging, toothpaste and more, each with an honest tag.
Built like the forum will be
Three habits every guide models now, and every thread will follow later.
Log the routineProducts, doses, timelines. Critique grounded in ingredients, not brand loyalty.
Tag the claimResearch-backed, mixed, or convention. "I read somewhere" gets sent back for receipts.
Track the changeStandardized photos, monthly cadence, so progress is visible instead of imagined.
Good skin advice survives being asked for its sources. Everything here has been asked.
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