Evening Primrose - can taking primrose cause weight gain?

Evening Primrose Oil
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Evening Primrose Oil:

Headache; indigestion; nausea; soft stools.

Seek medical attention right away if any of these SEVERE side effects occur when using Evening Primrose Oil:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).