Dr. Barbara Sturm Sun Drops SPF 50 This sunscreen serum, Dr. Barbara Sturm Sun Drops SPF 50 ($145), offers protection against UVA and UVB rays and also guards against free radicals and the premature ageing that can come from excessive sun exposure. Image Source: sephora.com Dr. Barbara Sturm Sun Drops SPF 50 $145 from sephora.com Buy Now