Vitamins, probiotics, and other products iHerb sell can be affected by exposure to heat, water, and/or the elements. Many vitamins and other supplements may degrade faster and lose effectiveness when exposed to excessive heat, light, oxygen in the air, and/or humidity. There is a risk of products providing lower levels of vitamins or other nutrients when exposed to such conditions. Likewise, there is also a risk of customers actually consuming more of a certain nutrient than they are aware of. Heat harms the potency and effectiveness of a variety of vitamins and nutrients. Degradation generally starts to occur in foods or beverages exposed to temperatures of greater than 120 °F (48.88°C).