Carbohydrates are the primary products of photosynthesis, a process by which solar energy is converted into chemical energy. This synthesis occurs in photoautotrophic organisms that contain chlorophyll or other photosynthetic pigments:

Green plant cells: These are the primary producers on Earth, synthesizing glucose and storing it as starch.

Algae: Both green and blue-green algae (cyanobacteria) perform photosynthesis to produce their own food.

Some bacteria: Specific types, such as cyanobacteria, purple sulfur bacteria, and green sulfur bacteria, use specialized pigments (like bacteriochlorophyll) to synthesize carbohydrates.