Read a sunscreen package in two passes: first check its SPF, broad-spectrum claim and water-resistance time; then turn to Drug Facts for ingredients, warnings and directions. The front helps you shortlist a product. The back tells you how to use that exact formula.
This guide concerns U.S. labels, with regulatory information checked November 5, 2026. FDA explains that nonprescription medicines use a consistent Drug Facts structure. A familiar layout makes comparison easier, but it does not make different products interchangeable.
Start with the three protection statements
SPF describes tested sunburn protection, principally against UVB. It is not a number of hours you can stay outside. Broad spectrum identifies protection against both UVA and UVB. Water resistant must specify 40 or 80 minutes; it does not mean protection survives every swim, towel or workout. FDA’s sunscreen consumer guidance explains these distinctions.
Read the statements separately. A large SPF number cannot answer whether the product has broad-spectrum protection. A beach illustration cannot answer whether it is water resistant. If a statement is missing from the retailer’s photograph, get a readable photograph of the full package before deciding.
A fictional label, annotated section by section
The following is an invented teaching example called “Example Lotion”: Broad Spectrum SPF 30, Water Resistant (40 minutes), zinc oxide 20%. It is not a real product, tested formulation, complete label or template for manufacturing. The entries below paraphrase the sections so you can find them on your own bottle.
| Section | Fictional example | What to do with it |
|---|---|---|
| Active ingredient | Zinc oxide 20% | Copy the filter name and percentage. Do not interpret 20% as SPF 20. |
| Purpose | Sunscreen | Identifies the ingredient’s intended drug function. |
| Uses | Sunburn protection; additional risk-reduction wording subject to labeled conditions | Read the conditions attached to any claim, including other sun-protection measures. |
| Warnings | External use; restrictions for damaged skin and eyes; stop-use advice | Read every warning before applying, rather than assuming your last bottle had identical instructions. |
| Directions | Application before exposure; reapplication after water exposure and towel drying | Turn these directions into reminders for your planned activity. |
| Other information | Protection from excessive heat and direct sunlight | Choose a storage location that meets the instruction. |
| Inactive ingredients | Formula ingredients other than the sunscreen active | Check against any specific ingredient-avoidance advice you have received. |
| Questions or comments, if supplied | Manufacturer contact information | Use it for questions about the exact formula or package. |
The framework comes from 21 CFR 201.66 on OTC labeling. “Inactive” distinguishes an ingredient’s regulatory role from the active drug ingredient; it is not a promise that the ingredient is irrelevant to your preferences or individual tolerability.
Read the directions as an activity plan
The sunscreen-specific rule, 21 CFR 201.327, provides for application 15 minutes before exposure and reapplication at least every two hours. Water-resistant labels add the stated 40- or 80-minute swimming or sweating interval and immediate reapplication after towel drying. Products without water resistance direct users to choose a water-resistant sunscreen for swimming or sweating.
For the fictional lotion, the useful note is “40 minutes in water; immediately after towel drying,” not “SPF 30 lasts all afternoon.” Write the interval beside the activity where you need it. Keep the container available so an unexpected change of plans does not leave you guessing.
Understand the conditions on Uses
The same rule permits qualifying broad-spectrum SPF 15 or higher products to carry skin-cancer and early-skin-aging risk-reduction wording when used as directed with other protective measures. Other products have more limited labeling. This is conditional risk reduction, not a guarantee or permission to extend exposure. Read beyond the first line of Uses.
Check information outside Drug Facts
Find the net quantity, expiry and lot code as well. They may be elsewhere on the carton or container. FDA advises discarding expired sunscreen and sunscreen whose age you do not know. If there is no expiry, its consumer guidance says to mark the purchase date and discard it after three years. A partly used bottle inherited from someone else needs an age check before a price comparison.
For an SPF moisturizer, read both its cosmetic description and its sunscreen directions. “Moisturizer” on the front does not replace the directions on the back. Our existing guide to comparing skincare products helps organize broader formula and evidence questions.
A pocket check before buying
- SPF and broad-spectrum statement: copied separately.
- Water resistance: 40 minutes, 80 minutes or no claim.
- Active ingredients: exact names and percentages.
- Warnings and directions: readable on the actual package.
- Expiry or known purchase date: checked.
- Planned activity: directions fit what you will be doing.
Take one bottle you already own and complete that check today. Ask a clinician about use on children under six months, sun allergy, skin changes or medication-related concerns. Continue through our Sun Protection section, the parent Skincare section or the PureRadianceHub home page.