b12 injection intramuscular or intravenous Vitamin (IM Shot) No.1 B12 IM Injection -
Description
297 , F106F113 (2009)

Management approaches include increasing fiber intake gradually (too much fiber at once worsens bloating), drinking at least 64 ounces of water daily, taking magnesium citrate (400-600mg at bedtime), and increasing physical activity

You can see which symptoms improved considerably (green arrows), and which symptoms remained unchanged (red arrows)

Cost-Effective: B12 injection kits are generally more affordable than professional injections
