Yes, a vitamin B12 deficiency can lead to glossitis, which may cause a sore, red, or inflamed tongue and sometimes manifest as cuts or cracks. To help alleviate symptoms, discuss suitable dietary changes or supplements with your doctor. Regular monitoring of your vitamin levels is also recommended.

A vitamin B12 level of 100 pg/mL is significantly low, and your symptoms of numbness and tingling suggest neurological involvement, which requires prompt medical attention. It is typically recommended to start with B12 injections until your symptoms improve, followed by maintenance injections every 1-2 months. While high-dose oral tablets may be used in some cases, injections are generally preferred for neurological symptoms, as they correct the deficiency more quickly and help prevent permanent nerve damage. You should consult your doctor promptly to start treatment and determine the dosage and schedule that are suitable for you.

A homocysteine level of 42 ?mol/L is elevated, but it is very manageable. The most effective way to lower it is by supplementing with specific B vitamins, as deficiencies are the most common cause. You should consider taking Vitamin B12 (cobalamin), Vitamin B9 (folic acid or methylfolate), and Vitamin B6 (pyridoxine). Sometimes, a supplement called betaine (TMG) is also suggested. I highly recommend consulting your doctor to check your baseline vitamin levels. This will help determine the exact dosages you need. Please do not worry, as this is a very common issue that typically responds well to these simple dietary supplements.

From a medical perspective, Methycobal (methylcobalamin) 500 mcg is safe but often insufficient as a maintenance dose, because oral vitamin B12 absorption is limited and lower doses may not reliably maintain adequate levels after a proven deficiency; however, any maintenance dose (oral or injectable) must be individualized and prescribed by a doctor based on blood B12 levels, symptoms, and the cause of deficiency. Patients should not self-medicate or change doses on their own, as inappropriate dosing may delay diagnosis of underlying conditions or proper treatment. Regular follow-up and laboratory monitoring are essential to determine the correct maintenance regimen.

Methycobal (methylcobalamin) is usually given as an intramuscular injection. If you are administering this yourself, the safest and easiest site to use is your outer thigh. If a healthcare professional or caregiver is assisting you, the upper arm or buttocks are also common options. Please ensure a doctor or nurse has shown you the proper injection technique before trying this at home. Always use a sterile needle and clean the skin with alcohol first. So please reach out to your clinic if you need a quick demonstration.

While your vitamin B12 level of 350 is within the normal range, it is on the lower side (borderline), and your symptoms may be related but are not specific to a deficiency. Taking 500 mcg of methylcobalamin daily is generally safe and may help improve symptoms over time. However, it is advisable to consult your doctor first to rule out other causes of your foot pain, such as vitamin D deficiency, anaemia, or nerve issues, and to receive appropriate treatment.