Yes, you can take Endura Mass to help increase your calorie intake, but it should complement, not replace, a balanced, high-protein diet. Your low energy and weight struggles are likely worsened by smoking, which suppresses appetite and speeds up metabolism; cutting down on smoking is crucial. To safely boost energy and gain weight, focus on nutrient-dense foods like eggs, bananas, and nuts. You can also consider a daily multivitamin (such as Zincovit) and a high-quality whey protein supplement. Please consult a doctor to rule out any underlying issues like thyroid imbalances before starting new supplements.