Undefined

Sun Serum Broad Spectrum SPF 50.

Sunscreen

About this product

A mineral sunscreen with SPF 50 broad spectrum protection and 22% zinc oxide, formulated to provide hydration and UVA protection.

Full ingredients

Zinc Oxide (12%), Water, Caprylic/Capric Triglyceride, C12-15 Alkyl Benzoate, Propanediol, Tridecyl Salicylate, Polyglyceryl-4 Diisostearate/Polyhydroxystearate/Sebacate, Methylheptyl Isostearate, Jojoba Esters, Niacinamide, Nylon-12, Methylpropanediol, Silica, Rubus Idaeus (Raspberry) Seed Oil, Tremella Fuciformis Sporocarp Extract, Allantoin, Bisabolol, Oryza Sativa (Rice) Bran Extract, Helianthus Annuus (Sunflower) Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Tocopherol, Coco-Caprylate, Caprylyl Glycol, Polyglyceryl-2 Dipolyhydroxystearate, Hydrogenated Lecithin, Lecithin, Phenylpropanol, Sodium Chloride, Tetrasodium Glutamate Diacetate, Sodium Hydroxide, Iron Oxides (Ci 77491, Ci 77492, Ci 77499)

Guru Score

84%

Yay

3 experts · Moderate agreement

3Gurus

3Yay

0Mixed

0Nay

What they liked

Lightweight, less oily than previous formula
Hydrating mineral sunscreen, especially for dry skin
Water resistant to 40 minutes

What they flagged

Separates and degrades over time
Too oily for combination skin
Performance under makeup not as strong as old formula

What the gurus are saying

This oil-forward mineral sunscreen earns consistent praise for deep hydration, particularly from those with dry or irritated skin. It provides solid UVA protection through 22% zinc oxide and resists water for 40 minutes. However, the formula faced stability issues this year, with separation reported, and the new version doesn't perform as reliably under makeup, so makeup wearers may want to test it first.

Synthesized from 3 expert reviews · most recent take June 2024

Type

Sunscreen

Key actives

NiacinamideVitamin ESPF

Formula notes

Fragrance-freeNo drying alcohol

Where to buy

Amazon → Google →

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What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Yay takes Nay takes Mixed takes Hide sponsored

HotandFlashy

1.23M subs

✓Yay

"This one is very oil forward and it's really great for people with super dry skin um some people if you have more combo skin you may find it to be just a little bit too oily feeling on your skin but if you have really dry skin this is amazing especially in the winter and I love this one so much"

All 9 takes from HotandFlashy

RANKING The 15 BEST Mineral Sunscreens From Over 200 I've Tested!

"This year it came in fourth for me it wasn't as good because it was perfect under makeup before the old formula but the new formula goes on less wet feeling less oily feeling than the old formula"

Summer Skincare Routine Vlog!

"I do like this one a lot though because it is 22 zinc so I think it probably does have really good UVA protection as well"

I Tried $900 Of Mineral Sunscreen So You Don't Have To! White Cast? Greasy? Good Under Makeup?

"I'm giving it four out of five as a standalone sunscreen but only three out of five for under makeup"

Holiday Party Makeup with Easy Long-Wear Red Lip! Tips & Tricks for Mature Women!

"I'm wearing my undefined RNR sunscreen which is why my skin is a little bit dewy but this is a really hydrating mineral sunscreen it works really well under my Holy Grail Foundation"

Winter Anti-Aging Skincare Routine Update! Over 40, 50, 60+

Best Skincare & Anti-Aging of 2023! Everything You Need to Age Backwards At Home!

"One of my alltime Holy Grail sunscreens did go through some Growing Pains this year that is the undefined RNR sunscreen"

How to Pack 10 Days of Outfits (+ Skincare, Makeup, Haircare) in ONE Carry-On Suitcase!

"I'm also have my undefined r r sunscreen in there this one is water resistant to 40 minutes"

Ingredients You CAN Use With Retinoids | According To Science!

"I also love the undefined RNR sunscreen that is an mineral tinted sunscreen it comes in three different shades it's an spf50 with a pa+++ plus that one's really hydrating especially if your skin is dry or irritated from using troin"

Skincare Empties | Skincare for Collagen + Menopausal Dry Skin!

"It's such a good sunscreen it has been my Holy Grail for a couple of years now"

Skin Obsessed Mary

33k subs

✓Yay

"This is the r r sun Serum by undefined and I just love it it was a recent discovery for me this year and my sunscreen Challenge and I just love it"

All 3 takes from Skin Obsessed Mary

☀️ I Tested 11 Sunscreens (so you don't have to) | Skin Obsessed Mary

"This was one of those I can see this becoming a Holy Grail one that I'm going to reach for over and over again"

⭐️ Airplane Skincare | Skin Obsessed Mary

"This is the r r sun Serum by undefined and I just love it it was a recent discovery for me this year and my sunscreen Challenge and I just love it"

⭐️ Summer SKINCARE Faves & Fails | Skin Obsessed Mary

"It started to degrade and it started to separate so you could see the color sitting separate from the oils and it got disgusting"

James Welsh

1.58M subs

✓Yay

"The Undefined R.R Sun Serum is possibly one of my favorite sunscreens of not just this year but of all time so far. I've been wearing it for two and a half weeks now with absolutely no issue."

Top Pick: sunscreen

What the evidence says.

Independent of what the gurus think, this is what the published research supports about the main active ingredients here.

Niacinamide

Niacinamide has evidence behind it for redness, uneven tone and supporting the skin barrier, and it is usually well tolerated even by skin that reacts to most things.

Source: DermNet

Sunscreen filters

Sun protection is the best evidenced way to slow visible ageing, and the filters are what does the work. Mineral and chemical filters both protect when a product is applied thickly enough and often enough, which is where most people fall short rather than on the choice of filter.

Source: DermNet

Humectants and emollients

Ingredients like these draw water into the surface layers and slow how fast it leaves. The evidence is for comfort, softness and hydration rather than for changing the structure of the skin.

Source: DermNet

Frequently asked.

What is Undefined Sun Serum Broad Spectrum SPF 50?

A mineral sunscreen with SPF 50 broad spectrum protection and 22% zinc oxide, formulated to provide hydration and UVA protection.

Is Undefined Sun Serum Broad Spectrum SPF 50 worth it?

Yes. All 3 gurus who reviewed it give it their stamp of approval, for a Guru Score of 84%.

What is Undefined Sun Serum Broad Spectrum SPF 50's Guru Score?

Undefined Sun Serum Broad Spectrum SPF 50 holds a Guru Score of 84%. That is our read on how warmly the experts talk about it, based on the verdicts of 3 expert reviewers we have collected. At least one expert has named it a Top Pick in its category.