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Just wondering if anyone has been diagnosed with a B12 deficiency, and if it was treated by just a better diet or with supplements.

It was treated with injections

As a primary care provider, I have many clients with B12 deficiency. It is very hard to bring your level up with just diet, so pretty much all my clients use supplements. The oral B12 supplements (that can be bought over the counter) have been proven to be just as effective as the injections, and are less invasive, and take up less time for both client and provider. And they come in yummy flavors!

I got the injections and then switched to oral supplementation. I also increased my fish intake (I don't eat a much meat which may have caused the problem in the first place, although deficiency does seem to run in my family). Haven't had any issues since.

I did injections until my levels were high enough again. I have OTC supplements but never remember to take them regularly. I actually was thinking I need to get my levels checked again because I feel it's low again. Thanks for the reminder lol  
 
Changing your diet wouldn't be a bad idea but my doctor did say that it's fairly common for us North Americans to have low B12 due to our diet

It's incredibly common and increases as we age. I've read 15-20% of people can have a deficiency. Easy fix with oral supplements (research has shown they work as well for most people) or injections.

Out of curiosity what are the symptoms of a B12 deficiency?

You can have an irregular heartbeat, be lightheaded, and shortness of breath if it is affecting your heart and lungs, you can also have easy bruising. It can also affect you nervous system by causing tingling nerves, there are other symptoms but a blood test will determine if you are low.  
Seems as we age we may have problems with our GI tract that even if you eat things that are high in B12 you are not able to absorb the B12. I know for myself that just about all the foods that are high in B12 are the foods that I crave and do eat, but apparently there are many things that will cause you to be deficient.  
Thanks for the replies.

I also got the shots and now I'm doing the jamieson dissolvable b12, you put it under your tongue and absorbs directly, so you don't have to worry about gi issues

I used to have a B12 deficiency then I got injections once a week for about 2 months which brought it back up and now I take One A Day Women's gummies so it stays up!

A short read for those who might be interested, sometimes we blame not being ourselves on getting older when it can be something that is treatable. I'm not sure if it is a regular test, but by reading the link it could be something you could ask your doctor about if you are experiencing any of the symptoms.  
 
http://www.m.webmd.com/food-recipes/guide/vitamin-b12-deficiency-symptoms-causes

I cannot recall where I read it but B12 cannot be pulled from the digestive system into the blood system unless there is a significant amount of vitamin B12 already in the blood. A vicious circle.  
 
Oral supplements help if they are placed under the tongue so that it can be absorbed into the blood stream that way. Often the best way is to get it injected into the blood stream and then that injected supplement will then work at pulling more B12 from the food.  
 
Vitamin B12 is important for brain function. A deficiency has often been the root of many addictions. Once a certain level has been reached, there is not enough brain function to understand that there needs to be a nutritional intervention. It was my addition to processed foods that depleted my level of B12.

I am on injections for the rest of my life for B12. My body stopped knowing how to process it so foods and oral medications made no difference because my body did nothing with them. I would suggest you talk with your doctor and continue to have your levels tested in order to see if your body is absorbing and using the B12 you are putting into it.

I will get b12 injections once a month the rest of my life. I have crohns disease and had a section of my bowel removed. The area which absorbs b12 from the foods I eat was removed.

I will get b12 injections once a month the rest of my life. I have crohns disease and had a section of my bowel removed. The area which absorbs b12 from the foods I eat was removed.

Your body wont absorb b12 if there is an issue with your intrinsic factor. I see a lot of people taking injections but the sublingual methylcobalamin is superior. Cyanocobalamin is what is in the injections and your liver has to strip the cyanide out of it first for you to be able to use it. Methycobalamin is used straight away by your body. If one has b12 issues they should have a blood test done for all of the b vitamins to make sure they're okay.