Do you need a vitamin B12 boost?

My father, who lived until he was 89, always swore that the Vitamin B12 shots his doctor prescribed gave him a boost of energy and helped him think more clearly.

http://chealth.canoe.ca/channel_health_news_details.asp?news_id=33495&rss=67&rid=999999&news_channel_id=10&channel_id=10&rot=3