Hello...
First of, I'd love to get to know your health and / or fitness goals. Strictly speaking longevity is a measure of how squeaky clean your system is on the inside. And, usually, the lesser the visceral fat you carry inside you, the better the metabolic physiology.
Best bet of living an optimal, disease-free long life is to get lean. In comparison to being lean, carnosine would pale in effective.
Next Steps
My suggestion: reduce calorie consumption and increase calorie expenditure (gym session isn't enough). Message me to get to know more.
TAKE HOME MESSAGE: No need to buy carnosine.
Health Tips
Book a consultation to discuss this further.