A few weeks later, you tie your hair into a ponytail and realise it isn't as thick as it used to be
Really smooth transaction
Neurological issues like neuropathy may take longer, up to 3-6 months (Carmel, 2008)
There are lots of over-the-counter forms of B12 to choose from, including pills, lozenges, and sublingual tablets
This complex process means that conditions affecting the stomach or intestines can significantly impair B12 absorption, including pernicious anaemia, atrophic gastritis, previous gastric surgery, coeliac disease, Crohn's disease, and long-term use of certain medications (such as metformin, proton pump inhibitors, and H2 antagonists)