NOW - Nature's Shield Protective Blend Oil - 30 Millilitre(s) - NPN: 00000000 -- NOW® Solutions Natures Shield is a contemporary version of the famed Four Thieves Vinegar thats been used in various forms for centuries.NOW® Nature's Shield Protective Blend is a versatile essential oil known to support a healthy immune system. Use as a non-toxic household cleaner to eliminate environmental and seasonal threats or create a relaxing, energizing aroma by diffusing. Ideal for freshening and cleansing.