Medical Conditions and Medications Several other medical issues and certain medications can cause missed or infrequent periods: Hormonal Contraceptives: Birth control pills, patches, injections, implants, and hormonal IUDs can intentionally alter your cycle, often making periods lighter, less frequent, or even absent
Epidemiological information is used to plan and evaluate strategies to prevent illness and as a guide to the management of patients in whom disease has already developed
Safety and sourcing is important
However, by this point, you will be deficient in the money you have spent on needless injections, so Save Face recommend a full check-up with either your NHS GP or a private doctor, who can confirm your symptoms and any genuine deficiency with a blood test, and more importantly can prescribe the best type of B12 product and treatment programme to suit your needs.