As an e-commerce platform, Amazon's product selection and supply are based on market demand and business strategy considerations.

One possible reason is that Amazon focuses on product categories with greater scale and profit potential, such as electronics, household goods, and daily necessities. Medical and daily necessities may need to comply with specific regulations and standards, and involve expertise and responsibilities in the medical field, which may pose higher risks and challenges to Amazon.

Alternatively, Amazon can also choose to cooperate with other professional medical product suppliers to ensure that high-quality and compliant medical supplies are provided to consumers.