Your Sunscreen Questions, Answered

As summer approaches, one of the most important things you can do for your skin health is to wear sunscreen consistently — and wear it correctly. Here's what you need to know about choosing the right SPF and making sure your sunscreen is actually doing its job.

Does a Higher SPF Really Make a Difference?

Yes — though perhaps not as dramatically as the numbers suggest. Here's how common SPF values compare:

• SPF 30 blocks about 97% of UV radiation

• SPF 50 blocks 98% of UV radiation

How Much Sunscreen is Enough?

This is where most people fall short. Studies consistently show that the average person applies only 25–50% of the amount needed to achieve the SPF on the label. To get full protection, you need approximately 1 ounce (about 9 teaspoons) to cover your entire body. Here's a practical breakdown:

• Face, head & neck — 1 teaspoon

• Torso (front and back) — 2 teaspoons

• Each arm — 1 teaspoon per arm

• Each leg — 2 teaspoons per leg

• Total for full body: ~9 teaspoons / 1 oz

Don't Forget to Reapply

Applying sunscreen once in the morning is not enough. UV filters break down with sun exposure, heat, and sweat. To stay protected:

• Reapply every 1.5–2 hours when outdoors

• Reapply immediately after swimming or toweling off — even if the label says "water resistant"

• Use the same amount (about 1 oz for the full body) each time you reapply

Physical vs. Chemical Sunscreen: What's the Difference?

Not all sunscreens work the same way. Understanding the two main types can help you choose the one that's right for your skin and lifestyle.

Physical (Mineral) Sunscreen — Our Top Recommendation

Physical sunscreens sit on top of the skin and work by reflecting UV radiation away before it can penetrate. We recommend physical sunscreen as the best option for most patients — it is the gentler, lower-risk choice, particularly for people with sensitive skin, allergies, or hormonal concerns. Active ingredients include:

• Zinc oxide (look for at least 15–20% concentration)

Tinted Physical Sunscreen: Extra Protection for Your Face

For the face specifically, we recommend choosing a tinted physical sunscreen. Tinted formulas do everything a regular mineral sunscreen does — and more. The tint comes from iron oxide, which adds an important layer of protection against visible light, including blue light from screens and the sun.

Why does visible light matter? Visible light — particularly high-energy blue light — can trigger or worsen conditions like melasma and post-inflammatory hyperpigmentation (PIH), the dark spots that can follow acne breakouts. Standard sunscreens (even SPF 60) do not protect against visible light. Tinted mineral sunscreen does.

Tinted sunscreen at a glance:

• Active ingredient: Zinc oxide (reflects UV radiation)

• Key inactive ingredient: Iron oxide (blocks visible light, including blue light)

• Protects against UV radiation and visible/blue light

• Ideal for anyone prone to melasma, PIH, or post-acne dark spots

• Available in a range of shades to suit different skin tones

Chemical Sunscreen

Chemical sunscreens absorb UV radiation and convert it to heat, which is then released from the skin. Unlike mineral formulas, chemical filters are absorbed through the skin and into the bloodstream and circulation. Several commonly used chemical UV filters raise concerns worth being aware of:

• Oxybenzone — a common contact allergen; banned in Hawaii and several other jurisdictions due to environmental concerns

• Avobenzone, octisalate, octocrylene, homosalate — possible endocrine disruptors (research ongoing)

• Octinoxate — possible endocrine disruptor; banned in Hawaii and several other jurisdictions due to environmental concerns

The Bottom Line

Our recommendation is simple: choose a physical (mineral) sunscreen. It reflects rather than absorbs UV radiation, stays on the surface of the skin, and carries a much lower risk of irritation or hormonal disruption than chemical alternatives. For your face, upgrade to a tinted physical sunscreen — the iron oxide pigment adds meaningful protection against visible light that standard sunscreens miss entirely, making it especially valuable for anyone managing melasma or post-acne discoloration.

Whatever sunscreen you choose, the most important things are using enough of it and reapplying regularly. A well-applied SPF 30 mineral sunscreen will protect you far better than a perfectly formulated SPF 60 used too sparingly. Have questions about which sunscreen is right for you? Reach out to our clinic — we're happy to help.