1. Growth: Algae grow in the intertidal zone of the ocean and need to be planted and cultured in a suitable marine environment, which requires a lot of manpower and time input, and the required resource input will affect the cost.

2. Picking: High-quality seaweed needs to be picked by hand to ensure the integrity and quality of seaweed, and seaweed needs to go through strict cleaning, drying and packaging processes, which push up the price of seaweed.

3. Market demand: Seaweed is loved by consumers all over the world, which leads to a large demand for seaweed, and the demand exceeds supply, which makes the price rise.

4. Transportation: Seaweed is easily affected by moisture and needs special transportation and storage methods. These measures will increase the cost of seaweed.

Seaweed is a kind of food made of seaweed, which is used in sushi rolls and Japanese cuisine. Seaweed is high in heat. Excessive consumption will lead to heat accumulation in the body, cause obesity, increase the burden on the gastrointestinal tract, and cause indigestion. Seaweed contains a certain amount of salt, which needs to be eaten in moderation for people with high blood pressure or limited sodium intake.