Vitamin D& B12 deficiency. For review?

Vitamin b12 is very important vitamin playing major roles in our body needed for red blood cell synthesis, dna synthesis, many metabolic process in our body. It's deficiency could be due to many causes like malabsorption, dietary deficiency( if your vegan or vegetarian who doesn't consume meat or diary or any animal products), chronic alcoholic, chronic use of antacid agents.. it's symptoms include weakness, dry skin, tiredness, or lightheadedness,Heart palpitations and shortness of breath,Pale skin (anemia), A smooth tongue,Constipation, diarrhea, a loss of appetite,Nerve problems like numbness or tingling, muscle weakness, and problems walking,Mental problems like depression, memory loss, or behavioral changes.. Treatment includes avoid alcohol, avoid antacids, dietary supplements in form of b-complex tablets, have vit b12 rich foods like milk ,milk products, meat, chicken, eggs. Vitamin d is another major vitamin needed for bone growth by helping in absorption of calcium from food we consume. So it's obvious that it's deficiency wil lead to bone problems. Most of Indians are deficient in vitamin d levels. Normally vitamin d is derived from animal products so if your vegan or strict vegetarian you could be deficient in vitamin d. Other causes include avoiding Sun exposure(as ultraviolet rays help in formation of vitamin d in our body) , kidney problems, age factors, obesity, malabsorption. Symptoms include weakness, backpain, difficulty in performing activities, behavioral problems. Treatment includes vitamin d rich foods like fish and fish oils, egg yolks, cheese, fortified milk, and beef,liver. Vitamin d supplements( have even calcium supplements) , cod liver oil capsules.