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Oral supplements go through the digestive system, which slows absorption and limits how much your body can take in at one time

they don't block DHT

Lichen planus CDC | James Heilman, MD / Wikimedia Commons What it looks like : Purplish lesions on the inner arms, legs, wrists, or ankles can signify lichen planus, a skin rash triggered by an overreaction of the immune system

But people with a vitamin B-12 deficiency are usually treated with 500 mcg or more of vitamin B-12

For more on unusual symptoms that can signal a deficiency in vitamin B12, check out this video: What blood tests reveal a vitamin B12 deficiency Your doctor may order either a blood test or a urine test to assess vitamin B12 levels