The short answer: Panthenol is an underrated barrier-support ingredient that suits almost every skin type. Exosomes show promise, mostly after professional procedures. Castor oil can soothe some skin but can also irritate or clog pores. And most "GLP-1 skin care" is marketing: a topical product cannot do what a systemic medication does.
Every few months, a new ingredient takes over social media. Some deserve the attention. Some are older than they look. And some are mostly a clever label. Here is my reality check on four ingredients I have discussed with editors this year.
What does panthenol do for skin?
Panthenol is a form of pro-vitamin B5. Inside the skin, it converts to pantothenic acid, which supports cell metabolism and the production of fatty acids and ceramides in the outer layer of the skin. In plain terms, it strengthens the skin barrier, helps the skin hold water, and calms irritation.
As I told NewBeauty, it is especially helpful for sensitive, post-procedure, acne-prone, or over-treated skin. It also pairs well with retinoids and acids, because it can offset their dryness without reducing their effect.
Dr. Collins' tip: More is not always better. Panthenol works at low concentrations. Consistent use is what delivers the barrier benefit.
What are exosomes in skin care?
Exosomes are tiny, cell-derived messengers that carry signals between cells. Right now, they are used most often in professional dermatology settings after procedures like microneedling, fractional laser resurfacing, or radiofrequency treatments.
As I explained to CNN Underscored, in that setting they may help calm inflammation and support the skin's natural healing process. Research is still developing, so think of exosomes as a promising support step, not a miracle on their own.
Should you use castor oil on your face?
Castor oil is having a viral moment. Its main fatty acid, ricinoleic acid, has anti-inflammatory properties that may soothe irritated skin. It is also an emollient, so it can help keep minor wounds moist while they heal, and it has mild antimicrobial properties.
But as I cautioned in Prevention, prolonged use or poor dilution can lead to sensitivity or barrier disruption, and heavy oils can clog pores. Always patch test first.
How to patch test: apply a small amount to the inside of your forearm or behind your ear once a day for several days. If you see redness, itching, or bumps, skip it.
Does "GLP-1 skin care" actually work?
GLP-1 medications have changed many bodies quickly, and skincare brands noticed. But most "GLP-1 skin care" is a marketing concept, not a new scientific category.
As I told NewBeauty, GLP-1 medications work inside the body by affecting hormones and metabolism. A topical product cannot replicate those systemic effects. Some ingredients in these products can still improve how skin looks, but they cannot replace volume or structure that is lost after weight loss.
If you are on a GLP-1 medication and notice skin laxity, a dermatologist can walk you through what topicals can and cannot do, and which in-office options may help.
As featured in
- NewBeauty: Panthenol Is So Easy to Love, No Matter Your Skin Type
- CNN Underscored: What to Know About Exosomes in Skin Care
- Prevention: Should You Be Using Castor Oil on Your Face? Derms Weigh In
- NewBeauty: Does GLP-1 Firming Skin Care Actually Work, Or Is It Just Marketing?
Frequently asked questions
Is panthenol safe for sensitive skin?
Yes, it is well tolerated by most skin types, and it is often used specifically to calm sensitive or irritated skin.
Can I buy exosome products for home use?
Some topical serums include exosomes, but most of the current evidence comes from professional, post-procedure use. Ask your dermatologist before adding them.
Is castor oil good for acne-prone skin?
Use caution. It is a heavy oil that can clog pores in acne-prone skin. Patch test, and stop if you notice new breakouts.
Dr. Kristina Collins, MD, FAAD, is a Harvard-trained, double board-certified dermatologist and dermatologic surgeon, and the founder of foy. This article is for education and is not a substitute for advice from your own doctor.