What is the difference?
| Use | Zinc oxide | Zinc gluconate |
|---|---|---|
| Sun protection | An active ingredient used in sunscreen. | Choose sunscreen by its SPF and broad spectrum label, not a zinc gluconate claim. |
| Barrier care | An occlusive ingredient, meaning it helps form a protective barrier against water loss. | The supplement absorption comparison does not answer which topical formula protects the barrier better. |
| Oral supplementation | One of the zinc forms compared in absorption research. | A better supported option for absorption. |
| Acne decisions | Some occlusive barrier creams can aggravate facial acne. | Better oral absorption is not a reason to assume better acne control. |
Choose by the job the finished product is meant to do, because sharing a first name is not a qualification. For a skincare purchase, sunscreen directions and barrier cream directions matter more than an oral supplement comparison.12
Which should you choose for sunscreen?
Choose a finished sunscreen with zinc oxide if you want this ingredient for sun protection. Look for broad spectrum protection, which covers UVA and UVB radiation, and an SPF of at least 15. Zinc on the front of a pack is not an SPF rating, however large the font. A zinc oxide barrier cream should not replace a labelled sunscreen.1
- 1Apply sunscreen 15 minutes before sun exposure, following the product directions.
- 2Cover all exposed skin, avoiding the eyes and mouth. Include easily missed areas such as the ears, neck, hands and hairline.
- 3Reapply at least every two hours, and more often when swimming or sweating. Follow the labelled water resistance duration.
Use sunscreen alongside shade and protective clothing. Water resistant sunscreen remains effective for a labelled 40 or 80 minutes during swimming or sweating; no sunscreen is waterproof.1
Which should you choose for barrier care?
Zinc oxide is an ingredient in barrier creams that help protect skin from irritants and drying out. These products can be useful for very dry skin and irritation associated with frequent water contact or friction. Barrier creams also come as pastes, ointments and sprays, so the word cream does not settle the texture question. Apply sparingly and reapply as needed; barrier products can remain on the skin for several hours, including after gentle washing.2
Take care with occlusive barrier creams on an acne prone face because some can aggravate acne. Most barrier creams should not go directly onto broken skin. Although generally well tolerated, their preservatives, fragrances or other ingredients can cause allergic contact dermatitis, an allergic skin reaction.2
Is zinc gluconate better as a supplement?
Zinc gluconate is the better supported choice when absorption is the deciding factor. Zinc supplements can help treat zinc deficiency, but absorption also depends on intake and diet. Phytate, a substance found in grains, legumes, nuts and seeds, binds zinc in the gut and reduces absorption. The proportion absorbed also falls as zinc intake rises, so a larger dose does not produce a proportionally larger absorbed amount.3
What if you are comparing them for acne?
Do not use supplement absorption as a shortcut for choosing an acne treatment. Established topical acne options include benzoyl peroxide, retinoids, salicylic acid and azelaic acid. Choosing a zinc supplement and choosing a treatment to apply to acne are separate decisions.4
Where this answer comes from
- 1Sunscreen: How to Help Protect Your Skin from the Sunfda.gov
- 2Barrier creamdermnetnz.org
- 3Comparative Absorption and Bioavailability of Various Chemical Forms of Zinc in Humans: A Narrative Reviewpmc.ncbi.nlm.nih.gov
- 4Acne clinical guidelineaad.org
