I found information on two products: rosehip extract and Konjac jelly. There is no information on a product called "rose and fairy weight loss jelly." Here are the details on the two products:

Rosehip extract:

• Positive: A randomized, double-blind, placebo-controlled clinical trial found that daily intake of rosehip extract decreased abdominal visceral fat in pre-obese subjects.
• Negative: There is no negative information on rosehip extract in the search results.

Konjac jelly:

• Positive: Konjac jelly is a low-calorie, natural weight loss diet supplement food that contains only 7 kcal in a 150ml tube. It can help with appetite suppression and gives a feeling of satiety. It is also convenient to take anywhere and anytime.
• Negative: Ingesting too much Konjac can cause gastrointestinal problems, and the noodles have reportedly been linked to intestinal blockages requiring medical attention. However, there is no negative information on Konjac jelly in the search results.

There is no information on the ingredients or materials of a product called "rose and fairy weight loss jelly."