1. Lack of regulatory standards: due to the variety and uneven quality of raw materials used in enzyme preparation products, the quality of enzyme preparation is difficult to guarantee. In terms of supervision, there is no uniform standard and specification for enzyme products, which makes it difficult for consumers to judge the quality and safety of enzyme products.

2. The effect has not been fully verified: although the enzyme is promoted as an environmentally friendly, natural and harmless biodegradable agent, its actual effect has not been fully verified. Some studies show that the role of enzymes in degrading organic wastes and purifying the environment is not obvious, and may even have negative effects.

3. Backward production technology and equipment: The technology and equipment of enzyme preparation production are relatively backward, and the production process is not mature enough, which limits the quality and output of enzyme preparation products.

4. Low consumer awareness: Because enzyme products have not been widely popularized, many consumers have low awareness of enzyme products and do not understand their efficacy and role, which also affects the marketing of enzyme products to some extent.

Based on the above points, we can see that there are many reasons why enzymes are not popular, including the lack of regulatory standards, the effect has not been fully verified, the production process and equipment are backward, and the consumer's awareness is low. In order to improve the quality and market acceptance of enzyme preparation products, it is necessary to strengthen supervision, improve production technology and strengthen consumer education.