It is generally safe for breastfeeding mothers to take multivitamins, including those labeled as "A-Z." However, it is important to consult with your healthcare provider before starting any new supplement regimen. They can assess your specific nutritional needs and recommend a suitable multivitamin that meets both your budget and safety requirements. Additionally, maintaining a balanced diet rich in fruits, vegetables, whole grains, lean proteins, and healthy fats can also help provide the necessary nutrients for optimal energy levels. Remember to prioritize self-care by getting enough rest, staying hydrated, and engaging in regular physical activity to combat fatigue.