It depends on deficiency level and absorption
Oral B12 supplementation requires much higher doses to achieve similar therapeutic effects
Stability, Storage & Multi-Dose Handling The 28-Day Rule for Punctured Multi-Dose Vials of Bacteriostatic Water Unopened vials should be labd at controlled room temperature, 20C to 25C (68F to 77F)

IV Vitamin Infusion Anti-Ageing / Wellness Contains Prabinex Part A&B (Vitamin B Complex): Thiamine Hydrochloride B1 Riboflavin B2 Pyridoxine Hydrochloride B6 Nicotinamide B3 Ascorbic Acid (Vitamin C) Glucose, Magnesium, 2ml B12 Best For General wellness and energy boost Anti-ageing and vitality Immune system support Mental clarity and focus Combating fatigue Skin Lightening / Brightening Glow & Radiance Contains Vitamin C 1000mg Glutathione 2400mg (Glycine, Cysteine, Glutamin Acid) Best For Skin brightening and radiance Reducing hyperpigmentation Anti-ageing and skin quality Detoxification and antioxidant protection Achieving glowing complexion Total Hydration Rapid Replenishment Contains 2ml B12 Magnesium 1000mg Vitamin C 500mg Best For Dehydration (post-illness, hangover, travel) Rapid rehydration Energy restoration Electrolyte replenishment Recovery from exercise or dehydration Sports Performance Athletic Optimisation Contains Prabinex Part A&B (Vitamin B Complex): Thiamine Hydrochloride B1 Riboflavin B2 Pyridoxine Hydrochloride B6 Nicotinamide B3 Ascorbic Acid (Vitamin C) 4ml B12, Glucose Magnesium 1000mg Vitamin C 1500mg Glutathione 600mg (Push) Best For Athletic performance optimisation Faster recovery post-training Enhanced endurance and stamina Muscle recovery and repair Pre-competition preparation Fast, Effective Vitamin Delivery in Minutes Vitamin Injections: Quick Boost Alternative Prefer a quicker option than IV drips

I have tried to lose weight for the last 2 years