--your B12 level is not high by most lab ranges--in fact, most of us here would consider that level barely adequate; we like to keep our B12 levels in the four figures, so there's plenty for our bodies to use for metabolic and neuroprotective purposes. (What lab had that range, anyway? Many of us tend to think the lab ranges in the US are too low--in Europe and Japan most lab ranges start at 500/550 and have no upper limit . . .)

B12 has no known toxicity level--there are studies from Japan in which people took up to 36mg/day intravenously with no side effects other than a bit of hyperness/invreased energy. (The USDA minimum requirement is 2mcg/day, thousands of times lower; those of us who are older or who suspect we may have absorption problems like to flood our bodies with at least 1000mcg or 1mg/day, so that we are assured of at least some getting to us by passive absorption--we don't rely on the presence of intrinsic factor to break B12 our of food in our stomachs.)