wich issues related to your hair that might be more noticiable signs ?

 * There are two issues related to your hair that might be more noticiable signs

• vit B12 helps making RBCs . they carry oxygen to hair Folliciently
  
  
  
• As a result : your Hair follicle may not be ableto grow new hair Efficiently.
• This will results in hair loss
• Anyone who has watched presidential hair change from campaign to campaign has noticed that stress seems to make hair turn gray, and a study on mice published in the journal Nature suggested that chronic stress may indeed contribute to graying hair by causing DNA damage and reducing the supply of pigment-producing cells in hair follicles. Stress can also cause your hair to fall out.
• Brittle hair is one symptom of Cushing's syndrome, which is a rare condition caused by too much cortisol, the body’s primary stress hormone. But, notes Mirmirani, there are many other more obvious symptoms of Cushing's syndrome, including high blood pressure, fatigue, and back pain.
• People who have hypothyroidism, a condition that occurs when your thyroid gland doesn't produce enough thyroid hormones, might notice increased hair shedding and a change in hair appearance, says Mirmirani. About 4.6 percent of the U.S. population ages 12 and older has hypothyroidism, although most cases are mild.
•  It can cause thinning hair and other symptoms, such as tiredness, cold intolerance, joint pain, muscle pain, a puffy face, and weight gain. A thyroid-stimulating hormone (TSH) test will diagnose the condition, and treatment entails taking thyroid medication.
• Protein is essential for hair health and growth (a lack of protein has been linked to hair thinning and loss). 
• Protein deficiency isn't a problem for most Americans, says Mirmirani — most adults need 0.8 grams of protein per kilogram of body weight. 
• Good sources of protein include nonfat Greek yogurt, tilapia, chickpeas, and chicken breast. People who have gastrointestinal difficulties or who just had gastric bypass surgery may have problems digesting protein.
•  These specialized situations will have to be managed with your doctor's help. But most hair thinning, even in women, is likely due to genetics.

*Vit B12 Deficiency can lead to symptoms of Anemia

often coupled with

1. low Iron with
2. Hair Thinning 
3. Hair loss

*A survey : 

• British Journal of Nurshing : on 1000 PTS.  - 30 % of them Experienced : hair loss, mouth ulcers,Blurred vision 

* Hair symptoms of Vit B12 Deficiency 

• If you are young and your hair turning gray
• It could Be due to Deficiency of vit B12
• As per Research : Vit B12 deficiency can cause premature hair grating
• A report Published in archives of dermatology
• Hypopigmentation og hair 
• Loss of hair colo
• Could Be part Vitamin B12  Deficiency.