How to Choose the Best Sunscreen

Your step-by-step guide to what to look for on the label.
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Your step-by-step guide to what to look for on the label.
How to choose the best sunscreen

According to the Environmental Working Group's latest report, 73 percent of sunscreens on the market provide inferior protection or contain worrisome ingredients.

I know they give a statistic like that every year, but I never fail to be shocked by it!

That means:

  • Hormone-disrupting sunscreen filters are still in widespread use,
  • Many manufacturers are selling formulas that don't actually meet the SPF claims on their labels, whether from... 
  • Too-low amounts of the active ingredients, and/or 
  • Ingredients that break down and become inactive in sunlight!

Crazy, right?

While application errors do exist due to product texture and format (like spray sunscreens, which are problematic because you can't easily see where you applied them), I think we can all agree that most sunscreens are failing us. 

Banana Boat is the most recent example of people getting burned—literally—by their sunscreen, and you'll probably remember the horror stories about Jessica Alba's Honest Company sunscreens a few years ago.

No wonder I get so many questions about how to find a decent SPF!

That's why I've created the guide below to help you out. It walks you through EXACTLY what to look for on the label—so you can be sure you're buying sunscreen that will properly protect you, and not harm your health!

Step 1: Is It Chemical or Mineral?

Alba Botanica Fragrance Free Sunscreen Lotion SPF 40

The name "Alba Botanica" might suggest that it's a mineral sunscreen, but it actually contains five chemical filters.

First, look at the active ingredients to determine whether it's a chemical or mineral sunscreen.

Never make assumptions from the packaging alone. The Alba Botanica Fragrance Free Sunscreen Lotion SPF 40 above looks like it should be mineral, based on the name ("botanica" implies "natural") and the fact that the brand does sell other non-chemical sunscreens. But this one is not—it actually contains more chemical filters than most (homosalate, octinoxate, octocrylene, octisalate and avobenzone). So you always have to inspect the ingredients!

Chemical Sunscreen Ingredients

  • 4-Aminobenzoic acid (PABA)
  • Avobenzone
  • Cinoxate
  • Diethanolamine methoxycinnamate
  • Dioxybenzone
  • Drometrizole trisiloxane (Meroxyl XL)
  • Ecamsule (Mexoryl SX)
  • Ensulizole
  • Enzacamene
  • Homosalate
  • Meradimate
  • Octinoxate (non-encapsulated*)
  • Octisalate
  • Octocrylene
  • Oxybenzone
  • Padimate O
  • Sulisobenzone
  • Triethanolamine salicylate

These chemical filters work by penetrating into your bloodstream. They may prevent sunburn, yes, but have limited effectiveness against the aging type of UV rays (UVA). They can also have hormone-disrupting and carcinogenic effects! Read more about chemical sunscreen dangers here

Related: 5 Reasons You Should Be Using a Natural Sunscreen

I recommend avoiding chemical sunscreens and choosing a mineral sunscreen filter instead. 

Mineral Sunscreen Ingredients

  • Titanium dioxide
  • Zinc oxide

* Encapsulated octinoxate can also be included here because it sits on top of the skin and acts like a mineral sunscreen.

Rather than absorbing into the body, mineral sunscreens remain on the surface of the skin and work by reflecting away the sunlight. They stay stable and there is no evidence for them causing any hormone-disrupting effects.

However, to get the best protection against both UVA and UVB rays, we need to ask a few more questions...

Step 2: Does It Contain Zinc Oxide?

Cyberderm Every Morning Sun Whip SPF 25

Cyberderm's Every Morning Sun Whip SPF 25 contains both zinc oxide and encapsulated octinoxate (which acts like a mineral).

The next thing to do is check whether you see zinc oxide on the label.

Titanium Dioxide Only

Don't buy any sunscreen that only contains titanium dioxide!

That's because titanium dioxide alone gives you just partial protection against UVA rays, so it's not truly broad-spectrum. It can protect you from a sunburn, but won't do enough against the longer UVA wavelengths that cause premature aging.

Zinc Oxide Only  
or Zinc Oxide + Titanium Dioxide/Encapsulated Octinoxate

As far as I'm concerned, zinc oxide is essential. Until we get the European filters Tinosorb M and Tinosorb S approved in North America, zinc oxide is the best filter we have and the ONLY one that offers complete UVA and UVB protection.

Look for zinc oxide alone, or in combination with titanium dioxide or encapsulated octinoxate. (Cyberderm's Every Morning Sun Whip SPF 25 is the only product I know of using the encapsulation technology, which makes it as safe as a mineral.)

The concentration of zinc oxide also matters, so now we proceed to the next question...

Step 3: How Much Zinc Oxide?

Biologique Recherche Protection U.V. SPF 25

With only 3.8 percent zinc oxide, Biologique Recherche Protection U.V. SPF 25 won't properly protect you from UVA rays.

Your next step is to check what percentage of zinc oxide is in the formula.

Less Than 15 Percent Zinc Oxide

I would avoid any sunscreens that are less than 15 percent zinc oxide. At that low of a concentration, the UVA protection is likely to be insufficient. 

Here's how it works. Every one percent of zinc oxide gives you 1.6 SPF units. That means a 15 percent zinc oxide formula is only about SPF 24, which would be the bare minimum—ideally, we want to aim for SPF 30!

Even lower is the new Biologique Recherche Protection U.V. SPF 25 above. With only 3.8 percent zinc oxide and 2.5 percent titanium dioxide, it works out to about SPF 12, with seriously inadequate UVA protection! Shocking from such a revered skincare brand.

15 to 20 Percent Zinc Oxide

If you see a figure between 15 and 20 percent zinc oxide, it should ALSO contain another sunscreen filter—either titanium dioxide or the encapsulated octinoxate—in at least a 7.5 percent concentration. This will get you to a true SPF 30, with sufficient UVA protection.

20 Percent or More Zinc Oxide

Any sunscreens with 20 percent or more zinc oxide will give you complete UVA and UVB protection. Hooray!

The higher the zinc oxide level, the higher the SPF. So if we go back to that 1.6 SPF units calculation, 20 percent zinc works out to SPF 32.

But there are a few more things you want to consider...

Step 4: Does It Contain Unstable Oils?

Neutrogena Sheer Zinc Face Mineral Sunscreen SPF 50

Choosing an oil-free sunscreen like Neutrogena's Sheer Zinc is the easiest way to avoid unstable oils that become toxic in UV light.

With all skincare products—not just sunscreen—I always check whether they contain polyunsaturated oils, which are unstable by nature.

Polyunsaturated Oils

  • Almond oil
  • Canola oil
  • Cottonseed oil
  • Grape seed oil
  • Peanut oil
  • Rose hip oil
  • Safflower oil
  • Sesame oil
  • Soybean oil
  • Sunflower oil

These are just a few examples, but there are many more! If you aren't sure whether an oil is polyunsaturated, you can always search the oil name name + "fatty acid profile" to find out.

I think any oil that's more than about 10 percent polyunsaturated should NOT be in a sunscreen. When UV light interacts with these types of oils, it can lead to pigmentation, premature aging and cellular damage (see study here).

If you can't be bothered looking up all these oils, the easiest solution is to choose a sunscreen that is oil-free, such as the Neutrogena Sheer Zinc Face Mineral Sunscreen SPF 50 above (it has 21.6 percent zinc oxide, too!).

There's one last safety issue to consider...

Step 5: Does It Contain AHAs or Vitamin A?

Derma E Natural Mineral Sunscreen SPF 30

Choose sunscreens free of AHAs and vitamin A, such as Derma E Natural Mineral Sunscreen SPF 30.

Now, look for any of the following ingredients:

  • Glycolic acid
  • Lactic acid
  • Retinol
  • Retinoic acid
  • Retinyl acetate 
  • Retinyl linoleate
  • Retinyl palmitate
  • Vitamin A

All of these may increase sun sensitivity and the possibility of sunburn, so they really don't belong in a sunscreen!

You can stop here OR check one final ingredient for extra bonus points...

Step 6 (Optional): Does It Contain Silicones?

Juice Beauty SPF 30 Oil-Free Moisturizer

Juice Beauty SPF 30 Oil-Free Moisturizer is silicone-free.

To be clear, silicones have no bearing on sunscreen safety or efficacy. But they can affect the condition of your skin, so I always try to avoid them if I can.

Silicones

  • Dimethicone
  • Methicone
  • Trimethicone
  • Cyclomethicone
  • Amodimethicone
  • Trimethylsilylamodimethicone
  • Cyclopentasiloxane
  • Polydimethylsiloxane
  • Dimethiconol

I choose sunscreens without these ingredients because they form a surface film that can trap debris in the pores, which can lead to breakouts. (I think they're especially problematic in products you wear while sweating.) Read more on my opinion of silicones here.

Related: 7 Reasons to Avoid Silicones on Your Skin

The Best Sunscreens

How to choose the best sunscreen

Four of the best sunscreens from Derma E, Juice Beauty, Cyberderm and Rocky Mountain Soap Company.

So which sunscreens actually measure up? Here are a few that tick off ALL my boxes.

These are high-zinc, and free of silicones, unstable oils, AHAs and vitamin A:

Keep an eye out for my annual sunscreen guide coming soon, with even more product options!

Conclusion

How to choose the best sunscreen

To find a safe sunscreen, don't rely on the brand name or packaging—analyzing the ingredients list is essential.

Now you have all the information you need to properly evaluate a sunscreen!

Again, I can't stress enough that reading the ingredient labels is key. Sadly, it's not as easy as simply choosing a natural product. And as you can see, the SPF numbers don't mean that much... not even the words "broad-spectrum." 

With something as important as sun protection, you just can't be too careful!

Does your sunscreen meet these criteria?
Have you tried any of my top SPFs—or found any others I should know about?