Humans need safe, natural ultraviolet (UV) radiation protection products that do not interfere with hormones, pollute ecosystems, or cause cancer. However, current sunscreen testing is costly. To address this problem, I evaluated plant oils (rapeseed, linseed, pumpkin seed, hemp seed, sesame) as synthetic UV filter alternatives by two methods: a traditional spectrophotometric approach and a self-made method – studying the growth of baker's yeast in Petri plates after using plant oil filters during UVA irradiation. All tested oils can absorb UVA radiation. The future of sunscreen production can be cheaper and greener: the developed method can significantly reduce sunscreen price, make the market consumer-friendly, and help companies save precious resources by providing preliminary results.