How to Choose the Best Sunscreen for Kids and Adults: A Pharmacist’s Guide

Last Reviewed: July 7, 2026

Standing in the sunscreen aisle feels a lot like standing in the cough and cold aisle. Dozens of bottles, big claims, tiny print, and a child tugging on your arm. I get asked about sunscreen at the pharmacy counter all summer long, and the questions are almost always the same. Which SPF? Mineral or chemical? Is spray okay? Can the baby wear it?

The good news? Sunscreen labels follow a predictable pattern, just like prescription labels. Once you know the five things to check, you can pick a great sunscreen in under a minute. Let’s go step by step.

What Sunscreen Actually Does

Sunscreen forms a protective barrier on your skin. It comes in a wide variety of forms, including creams, lotions, sprays, gels, and sticks, with many brands to choose from. Whatever the format, its job is the same: shielding you from two types of ultraviolet radiation:

• UVA rays penetrate deeper, drive premature aging, and also contribute to skin cancer. UVA is present all day and passes through clouds, windows, and even many fabrics, so cloudy days and car rides still count as exposure. UVA is also behind most sun reactions from photosensitizing medications (more on those below).
• UVB rays cause sunburn and play the biggest role in skin cancer. Clouds and windows filter most UVB, which is why you rarely burn indoors.

A sunscreen that only blocks UVB leaves your skin exposed to UVA damage you cannot feel or see in the moment. That is why the words broad spectrum matter more than almost anything else on the bottle.

Two more things shape your family’s real exposure. UV rays are strongest at midday and at higher altitudes, and they bounce back at you off water, sand, snow, and concrete, so a beach or pool day roughly doubles the dose. Before long outdoor days, check the UV index in your weather app. Environment Canada publishes it daily, and the higher the number, the faster unprotected skin burns.

One pharmacist detail worth knowing: in Canada, Health Canada regulates sunscreens as health products. Look for a DIN (Drug Identification Number) on chemical sunscreens or an NPN (Natural Product Number) on mineral sunscreens. In the US, sunscreens don’t carry a DIN or NPN. Instead, check for a Drug Facts panel showing “Broad Spectrum” and the SPF value.

The 5 Label Checks I Teach Every Family

1. Broad Spectrum

This is non-negotiable. Broad spectrum means the product protects against both UVA and UVB rays. If the label does not say broad spectrum, keep looking, no matter how high the SPF number is. Even the best broad spectrum sunscreen works as part of a team. Pair it with shade, hats, sunglasses, and sun-protective clothing whenever you spend time in the sun.

2. SPF 30 or Higher

Every sunscreen label carries an SPF, or sun protection factor. SPF compares how long protected skin takes to burn versus unprotected skin when you apply the recommended amount. Here is the catch: SPF 30 does not mean you can stay in the sun 30 times longer. Real-world protection depends on far more than the number on the bottle.

What SPF actually measures is protection against UVB rays:

• SPF 30 filters about 97% of UVB rays
• SPF 50 filters about 98%

Notice how small that jump is. SPF 50 is not “twice as strong” as SPF 30, and no sunscreen blocks 100% of rays. The Canadian Dermatology Association and most pediatric guidelines recommend SPF 30 as the minimum for daily family use. Going higher is fine, especially for fair skin, outdoor sports, or anyone on photosensitizing medications (more on that below). Just do not let a high number lull you into skipping reapplication.

Several factors change how much protection you actually get on any given day:

• How active you are: Sweating and swimming wash sunscreen away faster.
• How strong the UV rays are: UV intensity varies by day, season, location, and altitude.
• Your skin type: Lighter skin generally burns faster, though every skin tone needs protection.
• Medications and health conditions: Some common prescriptions speed up burning. I cover the main ones below.
• How much you apply and how often: This is the big one. Applying less than the recommended amount sharply cuts the protection, and it is the most common mistake I see. I break down exactly how much your family needs later in this post.

3. Mineral or Chemical (Know the Difference)

This is the question I hear most, and both types work when used properly.

Mineral sunscreens (also called physical sunscreens)

• Active ingredients: zinc oxide and titanium dioxide
• Sit on top of the skin and reflect or absorb UV rays
• Start working immediately
• Rarely irritate skin, which makes them my first choice for babies over 6 months, kids, eczema-prone skin, and sensitive skin
• The trade-off: they can leave a white cast, though newer tinted and micronized formulas have improved a lot

Chemical sunscreens

• Active ingredients like avobenzone, homosalate, octocrylene, and octisalate
• Absorb UV rays within the skin
• Rub in clear and feel lighter, which many adults prefer for the face
• Need about 15 minutes after application to reach full protection
• Slightly more likely to sting eyes or irritate very sensitive skin

My practical family rule: mineral for kids and sensitive skin, either type for healthy adult skin, and the best sunscreen is the one your family will actually wear. A perfect formula left in the cupboard protects no one.

4. Water Resistance

No sunscreen is waterproof. Instead, labels can only claim water resistance for 40 or 80 minutes. In practice, that number tells you how long the SPF holds up during swimming or sweating before you must reapply. For pool days, splash pads, and soccer tournaments, choose 80 minutes. Even then, reapply after toweling off, because the towel removes sunscreen along with the water.

5. The Right Format for the Right Job

• Lotions give the most reliable, even coverage. They are my default for kids.
• Sticks are brilliant for faces, ears, and squirmy toddlers, and they will not run into eyes. Apply 4 passes back and forth for adequate coverage.
• Sprays are convenient but easy to underapply. If you use one, spray until the skin glistens, then rub it in. Never spray directly on a child’s face. Spray your hands first, then apply, and avoid spraying in wind or near the barbecue, since many sprays are flammable until dry.
• SPF lip balm (SPF 30+) protects lips, a spot most families forget entirely.

Sunscreen by Age: What Changes and What Doesn’t

Babies Under 6 Months

Skip sunscreen as the main strategy. Young babies have thin skin and a higher surface-area-to-weight ratio, so the priority is keeping them out of direct sun entirely. Seek or create shade with stroller hoods, canopies, and umbrellas, and dress your baby in a wide-brimmed hat and lightweight, loose-fitting clothing that covers the arms and legs. If you are buying new, UPF-rated clothing of 50 or higher gives the most reliable coverage.

That said, if a small area such as the face or the backs of the hands cannot be covered, a minimal amount of mineral sunscreen (zinc oxide or titanium dioxide) is considered acceptable per pediatric guidelines. Specifically, mineral ingredients are the right choice here because they are minimally absorbed through the skin and less likely to cause irritation in a baby. Even so, the goal is simple: keep babies under 6 months out of direct sun.

Babies 6 Months and Older, Toddlers, and Kids

Choose a fragrance-free, broad spectrum, SPF 30+ mineral sunscreen. Do a patch test on the inner forearm the day before first use if your child has sensitive skin or eczema. Pair sunscreen with hats, rash guards, and shade breaks, especially between 10 a.m. and 3 p.m. when UV rays are strongest.

Teens and Adults

Any broad spectrum SPF 30+ product you enjoy wearing works. For daily facial use, lightweight chemical or tinted mineral formulas layer well under makeup. For acne-prone skin, look for non-comedogenic on the label.

Darker Skin Tones

Melanin offers some natural UVB protection, but not enough to prevent skin damage or skin cancer, and skin cancers in darker skin are often caught later. Everyone benefits from daily sunscreen. If white cast is the barrier, tinted mineral sunscreens or clear-finish chemical formulas solve it.

How Much and How Often (Where Most Families Go Wrong)

The most common sunscreen mistake I see is not the product. It is the amount. Most people apply a quarter to half of what they need, which quietly cuts an SPF 50 down to a fraction of its labelled protection.

A full adult application is about 35 mL, or 7 teaspoons. That is a bit more than a standard shot glass. The easiest way to hit that target is to portion it by body zone:

• 1 teaspoon for each arm
• 1 teaspoon for each leg
• 1 teaspoon for your chest and stomach
• 1 teaspoon for your back
• 1 teaspoon for your face and neck (or use the two-finger rule: a line of sunscreen down the index and middle fingers)

Then the habits that make the amount count:

• Apply 15 minutes before heading outside so it has time to bind to the skin
• Cover every area clothing, a hat, and sunglasses do not, and reapply every 2 hours, plus after swimming, heavy sweating, or toweling off
• Do not forget ears, the back of the neck, the backs of hands, tops of feet, hairlines, and scalp parts (or the whole scalp for very short hair or no hair)

If you finish a summer with a nearly full bottle, that is your sign the family is underapplying.

Sunscreen and Bug Spray: Which Goes First?

Summer at the lake means both bottles come out, and the order matters. Here’s the rule: apply sunscreen first, wait until it dries, then apply insect repellent on top. Why the order? Applying DEET at the same time as sunscreen can cut the SPF by as much as a third. Meanwhile, the repellent works just as well either way, so sunscreen always goes on first.

Two more tips from the pharmacy counter:

• When it is time to reapply sunscreen, know that layering it over DEET can shorten the repellent’s protection window, so plan to refresh the bug spray on long evenings too
• Combination sunscreen and repellent products are no longer sold in Canada, and for good reason. Sunscreen needs generous reapplication every 2 hours, while repellent does not, so one product cannot serve both jobs safely.

A Pharmacist’s Note: Medications That Make You Burn Faster

This is the part of sun safety most articles skip, and it is exactly where your pharmacist earns their keep. Several common medications can increase photosensitivity, which means faster, more severe burns at UV exposures that would normally be harmless. The classes I counsel on most often:

• Antibiotics: Tetracyclines (doxycycline), quinolones (ciprofloxacin), and sulfa antibiotics are frequent culprits. Doxycycline is the one I flag most, since it is commonly prescribed for acne and travel in exactly the sunny months.
• Acne and skin treatments: Oral isotretinoin and topical retinoids (tretinoin, adapalene, tazarotene) can thin the skin’s tolerance for sun. Teens on acne regimens need this counseling more than anyone.
• Blood pressure and heart medications: Hydrochlorothiazide and furosemide (diuretics), plus amiodarone and diltiazem, can all raise sun sensitivity.
• Common pain relievers: Several NSAIDs, including ibuprofen, naproxen, and topical or oral diclofenac, may trigger sun reactions in some people.
• Mood and mental health medications: Some tricyclic antidepressants and antipsychotics carry sun warnings. Check with your pharmacist rather than guessing from the drug name.
• Hormonal contraceptives and some natural products: Birth control pills and St. John’s Wort can both increase photosensitivity, a detail that surprises many of my patients because neither feels like a “medication” in the usual sense.

This list is not complete, and reactions vary from person to person. So if anyone in your family takes these, be stricter about using SPF 50, seeking shade, and wearing protective clothing. In the meantime, ask your pharmacist whether your specific medication carries a sun warning. Heat and sun affect medications themselves too. My guide to storing medications safely in summer covers which ones raise your risk of heat illness and how to protect them on hot days.

Storage and Expiry: Yes, Sunscreen Goes Bad

Sunscreen is a drug product, and it degrades like one:

• Check the expiry date every season. Expired sunscreen loses potency, and active ingredients like avobenzone break down first.
• Store it below 30°C (86°F). A sunscreen bottle baking in a hot car or sitting in direct sun at the beach degrades faster. Tuck it in the shade of your beach bag or cooler.
• Toss any bottle with separated, watery, gritty, or off-smelling contents, even before the expiry date.

The same habits that protect your medications in summer protect your sunscreen. Careful measuring and label reading matter here just as much as they do when you give children’s medicine.

Red Flags: When to Call Your Pharmacist or Doctor

Reach out if:

• Your child develops a rash, hives, or swelling after applying sunscreen
• Sunscreen gets in the eyes and irritation persists after rinsing
• A young child swallows sunscreen (call your local poison centre)
• Someone develops a severe burn with blistering, fever, chills, or signs of heat illness
• You are unsure whether a family member’s medication increases sun sensitivity

Pharmacists answer sunscreen questions all day in the summer. We would much rather help you choose the right bottle than counsel you through a bad burn.

Clinical Mama Takeaway

You do not need the most expensive bottle on the shelf. You need:

• Broad spectrum on the label
• SPF 30 or higher
• Water resistant for swim and sport days
• Mineral formulas for babies over 6 months, kids, and sensitive skin
• Enough product, reapplied every 2 hours
• Sunscreen first, bug spray second, with time to dry in between

Shade, hats, and clothing do the heavy lifting. Sunscreen covers what they cannot. Confidence comes from clarity. Join the Clinical Mama community for early access to new blog posts, wellness resources, family health tools, and everything new on Clinical Mama.

❓Frequently Asked Questions

Choosing Sunscreen

Applying and Using Sunscreen

📚References

1. Canadian Dermatology Association. Sun Protection and Sunscreen FAQ. Accessed from: https://dermatology.ca/public-patients/sun-protection/sunscreen-faq/
2. Health Canada. Sun Safety Tips and Sunscreens. Accessed from: https://www.canada.ca/en/health-canada/services/sun-safety/sunscreens.html
3. Canadian Pediatric Society, Caring for Kids. Sun Safety. Accessed from: https://caringforkids.cps.ca/handouts/safety-and-injury-prevention/sun_safety
4. Prevention and Treatment of Sun-Induced Skin Damage (CPS): Prevention and Treatment of Sun-Induced Skin Damage. Kleiman,      Nancy. Accessed June 30, 2026 from https://cps2.pharmacists.ca/document/minorailments/pvtn_treatment_of_sun-induced_skin_dmg
5. U.S. Food and Drug Administration. Sunscreen: How to Help Protect Your Skin from the Sun. Accessed from: https://www.fda.gov/drugs/understanding-over-counter-medicines/sunscreen-how-help-protect-your-skin-sun
6. U.S. Food and Drug Administration. The Sun and Your Medicine. Accessed from: https://www.fda.gov/drugs/understanding-over-counter-medicines/sun-and-your-medicine
7. Health Canada. Personal Insect Repellents. Accessed from: https://www.canada.ca/en/health-canada/services/about-pesticides/insect-repellents.html