When counseling a customer about a body lotion that does not contain tartrazine, the pharmacist should explain that:

In the context of counseling a customer about a body lotion that does not contain tartrazine, it's important to understand the relevance of ingredient labeling and potential allergens. The correct choice indicates that the concentration of tartrazine present may not be listed, which highlights a critical aspect of ingredient disclosures.

Tartrazine is a synthetic food dye that can cause allergic reactions in some individuals, particularly those with asthma or aspirin sensitivity. When a product claims to be free from a specific ingredient like tartrazine, it does not necessarily guarantee that it is completely free of all allergens. Ingredient labeling can vary, and while some substances must be declared due to regulatory requirements, others may not be listed clearly, especially in complex formulations.

Explaining this to a customer reinforces the idea that just because tartrazine is not explicitly mentioned does not imply that the lotion is devoid of allergens altogether. It could mean a lack of transparency in labeling, or that although tartrazine is absent, other allergens might still be present in the formulation. This understanding encourages consumers to look more closely at product ingredients and to remain cautious, particularly if they have a history of sensitivities or allergies.