Which injection is used to gain weight of double engine snake and what is its cost?

The injection commonly used to promote weight gain in double-engine snakes is called "vitamin B12" or "vitamin injections," which are often administered to boost appetite and improve overall health. The cost of these injections can vary widely based on location and supplier, typically ranging from $10 to $30 per dose. It's important to consult a veterinarian for the appropriate dosage and specific products suitable for your snake's needs.