AbstractThe seasonal variation in tocopherol content in four brown seaweeds was followed through a two‐year period. Considerable variation especially in the concentration of δ‐tocopherol was established. The higher concentrations were found during autumn and winter, and low contents in spring. Individual and diurnal variations were also studied. Considerable differences in tocopherol content between various types of tissue were established. Surprisingly high concentrations of tocopherols were found in the older parts of the plants.