We Asked The Experts What They Think
A TikTok video has sparked debate about the level of SPF we should be using every day.
by Rachael Martin |
Updated on28th April 2025 at 1.52pm
Read the full article here: https://graziadaily.co.uk/beauty-hair/skin/do-i-need-spf-100/
Dr Angela Tewari – Consultant Dermatologist at The Lister Hospital answers your questions
What is factor 100? Do we really need it?
SPF 100 (Sun Protection Factor 100) is a very high-protection sunscreen that theoretically gives you markedly more protection in the UVB and UVA ranges however the increase in protection compared to lower SPFs is marginal — for example, SPF 50. Also in terms of aesthetically appropriate on the skin, SPF 100 will leave a thicker residue compared to protection from an SPF 50 to give it that extra protection so if you have darker skin for example it may not be something that you would find comfortable to use day to day.
What’s the difference between SPF 50 and SPF 100?
Studies show that if both are used correctly and a good teaspoon of application of each, then over a 5-day period of sunshine exposure on a beach the sunburn likelihood is 8 fold less (kohli et al jaad 2020). This is significant and thus the Eucerin SPF100 is classified as a medical device. There are certain patient groups that would benefit from this.
Who might benefit from SPF 100?
– Individuals with very fair skin, albinism.
– Those with a history of sun damage / previous skin cancers at very much sun-exposed sites and those that are immunosuppressive treatment.
– People spending prolonged periods in intense sun (e.g. skiing, sailing, or tropical destinations).
– It can serve as an extra layer of safety when meticulous reapplication isn’t guaranteed and also even if you have a thick layer/residue.
Does SPF 100 have side effects?
SPF 100 itself doesn’t typically cause side effects beyond those of any sunscreen:
– Skin irritation or allergic reactions (usually due to fragrances or preservatives).
– Acne or clogged pores, especially with thick formulations.
– A false sense of security — users may skip reapplication or prolong sun exposure, undermining effectiveness.
– Choosing a broad-spectrum formula and reapplying every 2 hours remains crucial regardless of SPF level. I would prefer a SPF 30 to 50 with high UVA cover if you feel that you’d use it more frequently than SPF100.