Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa The 'magic' pink injection., Injecting Vitamin B12, mixed with whatever maintence injection you choose (most commonly used with corticosteroids), is often used to combat muscle soreness, spasms, or B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 Injections for Aging and Longevity InVita Wellness