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Below is a general timeline based on common clinical experience and published research, with the reminder that individual responses vary

References Heffernan M, Summers RJ, Thorburn A, Ogru E, Gianello R, Jiang WJ, et al

A shift in cellular composition could masquerade as a pathway down-regulation

I wouldnt count on sources like seaweed, spirulina, or soil. I hear people that likely do need to supplement with B12 say that theyre OK because they eat foods that may include B12, but they can be unreliable sources, such as sea vegetables or nutritional yeast, says Ginger Hultin, MS, RDN, CSO, a lifelong vegetarian, chair of the VNDPG, and spokesperson for the Academy