What vitamin deficiency causes muscle and joint pain?

The ranking by how common: vitamin D first by a distance, vitamin C a rare second

What vitamin deficiency causes muscle and joint pain is a question the textbooks answer by drama and the honest page answers by frequency, because the deficiency with the most vivid picture is not the one a reader in the UK is likely to have, and a doctor orders blood tests in the order of likelihood rather than the order of the textbook. First by a distance is vitamin D. Insufficiency is common in UK adults, affecting a large share through autumn and winter when the sun is too low for skin to make the vitamin, and deficiency produces a recognisable picture: aches in the muscles and bones, often diffuse and worse in the lower back, hips and thighs; proximal weakness, the heaviness that makes stairs hard to climb and a chair hard to rise from; fatigue; and cramps, with severe and prolonged deficiency softening bone into osteomalacia, in which bone and joint pain become marked and bones can bend or fracture. This is the deficiency a doctor tests first when muscle and joint pain has no mechanical cause, by a blood level, and it is corrected by vitamin D at ten micrograms a day through autumn and winter as the national guidance suggests for everyone, or at higher doses on a doctor's advice when a blood test shows deficiency, with the aches resolving over weeks to months as levels recover, the one muscle and joint pain a vitamin reliably fixes, in the reader who was deficient. Second, and a distant second, is vitamin C. Deficiency is rare in the UK outside very restricted diets, someone eating almost no fruit or vegetables for months, but its picture includes the joints: aching and sometimes swollen joints, particularly knees and ankles, alongside bleeding and swollen gums, easy bruising, small bleeds around hair follicles, dry skin, fatigue and wounds that heal slowly or reopen, the early form of scurvy, caused by the failure of collagen synthesis without its cofactor. It is confirmed by a blood level and the history, corrected within weeks by fruit and vegetables or a vitamin C tablet, and is the one deficiency on this page that is a collagen problem in any sense, which is why vitamin C holds the register's collagen formation sentence and why a collagen capsule pairs with it; collagen itself is not a vitamin and has no deficiency state, so no collagen deficiency causes anything.

The companions, the rule that outranks them all, and what a reader does with the ranking

Two companions belong on the list for completeness, because they are common and are often blamed for joint pain they do not mainly cause. Vitamin B12 deficiency rises with age, as absorption falls, and in those who avoid animal foods, and its picture is neurological and haematological rather than articular: tingling and numbness in the hands and feet, fatigue, breathlessness, a sore tongue, memory and mood changes and problems with balance, with muscle aches sometimes among them and joint pain rarely the leading complaint, confirmed by a blood test and corrected by tablets or injections depending on the cause. Iron deficiency, which is not a vitamin deficiency but arrives in the same blood test, is common in menstruating women and produces fatigue, breathlessness, pale skin, brittle nails and sometimes restless legs, again with joint pain rarely the main feature. Both are worth testing in a reader with fatigue and aches, and neither is the usual answer to joint pain. Then the rule that outranks every deficiency on the page: a joint that is swollen, hot or red, or that is stiff for more than an hour on waking and eases with movement, affecting the same joints on both sides, the small joints of the hands and feet, the wrists, is the pattern of inflammatory arthritis, a group of conditions diagnosed by blood tests and examination and treated early for good reason, and no deficiency produces that pattern, so a reader with it does not sort vitamins and does see a doctor promptly, with a vitamin experiment on that pattern being months lost. What a reader does with the ranking: a lifter with diffuse muscle and bone aches, heaviness on the stairs and fatigue through a British winter asks a doctor for a vitamin D level and takes ten micrograms a day meanwhile, since that is the common one; a reader eating almost no fruit or vegetables with aching joints and bleeding gums asks about vitamin C and eats an orange today; a reader with tingling and fatigue asks for B12 and iron; and a reader with a swollen or hour-stiff joint asks for an appointment this week. Collagen's place is honest and small: it is not a vitamin, has no deficiency, treats none of the above, and its capsule carries the vitamin C cofactor at 12mg, a contribution to a daily nutrient and not a correction of a deficiency, which needs a tablet or a fruit bowl. The worked example is that cofactor on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, the vitamin C contributing to normal collagen formation at 15% of its reference value, the collagen below the research band and no vitamin at all. What vitamin deficiency causes muscle and joint pain: vitamin D, commonly; vitamin C, rarely; and a swollen or hour-stiff joint is a doctor's question, not a vitamin's.

What to check on the label