There are many benefits to B12 injections, including an increase in the creation of red blood cells — which are responsible for carrying oxygen through our tissues so it can be expelled as carbon dioxide.

But three of the most popular reasons for B12 injections are to improve energy levels, to support metabolism and to prevent anemia.

Generally, B12 is known to boost energy in those lacking it, and regular intake of B12 helps establish and maintain healthy energy levels.

If you're otherwise healthy but find yourself constantly fatigued, talk with a doctor about a potential B12 deficiency. B12 injections may be able to increase your energy levels by introducing more oxygen into the body.

The oxygen is distributed through the bloodstream to major organs, increasing overall energy in the body. However, the effects are likely only present in those who have a B12 deficiency. Those who have regular levels of B12 are unlikely to experience an energy boost from a B12 shot

All the B vitamins are excellent at helping the body break down carbohydrates, fats and proteins. They're also important for maintaining a healthy metabolism, which is what does the breaking down of those three things.

Without adequate amounts of B12 — and any of the other B vitamins — the metabolism won't be able to do its job properly, which can make losing weight very hard.

Pernicious anemia is a type of anemia in which your body is unable to absorb vitamin B12, which then prevents your body from being able to produce red blood cells. Humans possess something called intrinsic factor, which is a protein the stomach creates to help the body absorb B12.

However, some people's immune system mistakenly destroys the cells that create the intrinsic factor. Without it, the body cannot absorb B12, and the lack of the vitamin results in pernicious anemia. B12 injections are useful to provide the body with the vitamins it needs to continue to create red blood cells.

What Are the Symptoms of B12 Deficiency?

Red blood cell production is the primary function of B12 in the body, so a deficiency can manifest as symptoms associated with anemia.

The symptoms of B12 deficiency can vary depending on the individual, but some common signs include fatigue, pale skin, dizziness, joint pain and tingling in the hands and feet. Additionally, individuals with severe deficiencies may experience difficulty walking or anemia.

If you think you are deficient in Vitamin B12, it's important to talk to your healthcare provider. Your healthcare provider can help diagnose a deficiency and create an appropriate treatment plan. With the right care, you can maintain adequate levels of Vitamin B12 and prevent many of its associated symptoms.

Folate deficiency happens when folic acid levels are too low. Folate is a B vitamin that’s important for healthy red blood cell production and the formation of new cells.

The average adult should get 2.4 mcg of vitamin B12 a day to maintain healthy energy levels and metabolism. Because the body loses the ability to absorb B12 as it ages, the dosage increases the older we get.

People who are pregnant or breastfeeding also require more than the average dosage, with 2.6 mcg being the recommendation. Dosage is not something that can be self-prescribed. If you suspect that you aren't getting enough B12 and may need injections or supplements, talk with your doctor to find out how much you need.

Drug interactions with B12 can occur, and some conditions may also reduce absorption. Your doctor will be able to help you determine the best dosage for your needs.

How Else Can I Get Vitamin B12?

The best way to naturally get B12 is to eat foods that are rich with vitamin B.

While a well-rounded diet is an ideal way to ensure you're getting enough B12, those on a vegan diet can look to certain plant milk with B12 as well as nutritional yeast and fortified cereals. B12 supplements in pill form are also an option, the dosage of which your doctor can recommend.

Animal foods like meat, fish and eggs are the best sources of B12, but if you don’t eat these foods regularly or can’t digest them, then injections or supplements may be the best way to increase your vitamin B12 levels.

Fortified foods are also a great way to get your daily dose of B12. Many plant-based milks, cereals and nutritional yeast are fortified with B12. This is a great option for those who do not eat animal foods or follow a strict vegan diet.

Vitamin deficiency can be treated with oral supplements, so a water soluble vitamin B12 supplement can be taken in pill form on a daily basis to make sure you're getting enough. However, it is always best to talk with your doctor first before taking any vitamins or supplements.