Mineral Sunscreen: What Does 19% Non-Nano Zinc Oxide Mean?

If you have seen 19% non-nano zinc oxide on a mineral sunscreen label, you may wonder what that number means. It identifies the active sunscreen ingredient and its concentration in the formula. It does not mean the product is “19% stronger” than another sunscreen, and the percentage alone does not determine the SPF.

TREEN Daily Mineral Sunscreen uses 19% non-nano zinc oxide to provide broad-spectrum SPF 45 protection. Here is a plain-language guide to what those terms mean and how to use mineral sunscreen correctly.

What is zinc oxide sunscreen?

Zinc oxide is a mineral sunscreen active ingredient. When applied evenly, it forms a protective layer on the skin that helps protect against ultraviolet radiation. It can provide broad-spectrum protection, covering both UVA and UVB rays.

• UVA rays contribute to visible skin aging and can reach the skin throughout the day.
• UVB rays are a major cause of sunburn.

Broad-spectrum protection matters because everyday sun care should address both types of ultraviolet exposure.

What does “19%” mean?

The 19% refers to the amount of zinc oxide used as the active sunscreen ingredient in the formula. Sunscreen performance is evaluated as a finished product, so rely on the labeled SPF and broad-spectrum directions rather than comparing percentages alone.

For TREEN Daily Mineral Sunscreen, the finished formula is labeled SPF 45 broad spectrum. It is also labeled water resistant for up to 80 minutes when used as directed.

What does “non-nano” mean?

“Non-nano” describes the particle-size category of the zinc oxide used in the formula. In practical shopping terms, it tells you that the mineral particles are not intentionally manufactured as nanoparticles. Mineral sunscreens can vary in texture and visible cast depending on the zinc oxide, the base formula, and how much is applied.

No sunscreen should be judged only by how invisible it looks. The most important step is applying enough product evenly and following the label directions.

How to apply mineral sunscreen correctly

1. Apply liberally and evenly to exposed skin before sun exposure, following the Drug Facts label.
2. Blend across commonly missed areas such as the ears, neck, hairline, chest, and backs of the hands.
3. Reapply at least every two hours.
4. Reapply after 80 minutes of swimming or sweating, immediately after towel drying, or as directed on the label.

Using too little sunscreen can leave uneven coverage. If mineral sunscreen is easier to apply in sections, work one area at a time while still using the full recommended amount.

Where sunscreen fits in a TREEN routine

In the morning, apply your TREEN facial serum or salve directly to clean, slightly damp skin. Allow it to settle, then apply TREEN Daily Mineral Sunscreen evenly as the final skincare step before makeup. If you are outdoors for an extended period, pair sunscreen with shade, protective clothing, a hat, and sunglasses.

Explore TREEN Daily Mineral Sunscreen SPF 45, made with 19% non-nano zinc oxide and baobab oil for a moisturizing mineral formula.

Frequently asked questions

Is 19% zinc oxide the same as SPF 19?

No. The active-ingredient percentage and the SPF number measure different things. This finished formula is labeled SPF 45.

Does mineral sunscreen need to be reapplied?

Yes. Reapply at least every two hours and after swimming, sweating, or towel drying as directed on the label.

Does water resistant mean waterproof?

No sunscreen is waterproof. An 80-minute water-resistance claim means you should reapply after 80 minutes of swimming or sweating, and sooner after towel drying.