hello vowel lady,
if you wish to read a good source of information on Vitamins etc.
please go to the link provided below

http://lpi.oregonstate.edu/infocente...mins/vitaminD/

partial information on Vitamin D - not specifically referencing Fibromyalgia
Muscle Weakness and Pain

Vitamin D deficiency causes muscle weakness and pain in children and adults. Muscle pain and weakness was a prominent symptom of vitamin D deficiency in a study of Arab and Danish Moslem women living in Denmark (20). In a cross-sectional study of 150 consecutive patients referred to a clinic in Minnesota for the evaluation of persistent, nonspecific musculoskeletal pain, 93% had serum 25(OH)D levels indicative of vitamin D deficiency (21). A randomized controlled trial found that supplementation of elderly women with 800 IU/day of vitamin D and 1,200 mg/day of calcium for three months increased muscle strength and decreased the risk of falling by almost 50% compared to supplementation with calcium alone (22).

Risk Factors for Vitamin D Deficiency

Exclusively breast fed infants: Infants who are exclusively breast fed and do not receive vitamin D supplementation are at high risk of vitamin D deficiency, particularly if they have dark skin and/or receive little sun exposure (19). Human milk generally provides 25 IU of vitamin D per liter, which is not enough for an infant if it is the sole source of vitamin D. Older infants and toddlers exclusively fed milk substitutes and weaning foods that are not vitamin D fortified are also at risk of vitamin D deficiency (18). The American Academy of Pediatrics recommends that all infants that are not consuming at least 500 ml (16 ounces) of vitamin D fortified formula or milk be given a vitamin D supplement of 200 IU/day (19).
Dark skin: People with dark skin synthesize less vitamin D on exposure to sunlight than those with light skin (1). The risk of vitamin D deficiency is particularly high in dark-skinned people who live far from the equator. In the U.S., 42% of African American women between 15 and 49 years of age were vitamin D deficient compared to 4% of White women (23).
Aging: The elderly have reduced capacity to synthesize vitamin D in the skin when exposed to UVB radiation, and are more likely to stay indoors or use sunscreen. Institutionalized adults are at extremely high risk of vitamin D deficiency without supplementation (24, 25).
Covering all exposed skin or using sunscreen whenever outside: Osteomalacia has been documented in women who cover all of their skin whenever they are outside for religious or cultural reasons (26, 27). The application of sunscreen with an SPF factor of 8 reduces production of vitamin D by 95% (1).
Fat malabsorption syndromes: Cystic fibrosis and cholestatic liver disease impair the absorption of dietary vitamin D (28).
Inflammatory bowel disease: People with inflammatory bowel disease like Crohn’s disease appear to be at increased risk of vitamin D deficiency, especially those who have had small bowel resections (29).
Obesity: Obesity increases the risk of vitamin D deficiency (30). Once vitamin D is synthesized in the skin or ingested, it is deposited in body fat stores, making it less bioavailable to people with large stores of body fat.
Assessing Vitamin D Nutritional Status

Growing awareness that vitamin D insufficiency has serious health consequences beyond rickets and osteomalacia highlights the need for accurate assessment of vitamin D nutritional status. Although there is general agreement that the serum 25(OH)D level is the best indicator of vitamin D deficiency and sufficiency, the cutoff values have not been clearly defined (17). While laboratory reference ranges for serum 25(OH)D levels are often based on average values from populations of healthy individuals, recent research suggests that health-based cutoff values aimed at preventing secondary hyperparathyroidism and bone loss should be considerably higher. In general, serum 25(OH)D values less than 20-25 nmol/L indicate severe deficiency associated with rickets and osteomalacia (16, 18). Although 50 nmol/L has been suggested as the low end of the normal range (31), more recent research suggests that PTH levels (32, 33) and calcium absorption (34) are not optimized until serum 25(OH)D levels reach approximately 80 nmol/L . Thus, at least one vitamin D expert has argued that serum 25(OH)D values less than 80 nmol/L should be considered deficient (16), while another suggests that a healthy serum 25(OH)D value is between 75 nmol/L and 125 nmol/L (35). Data from supplementation studies indicates that vitamin D intakes of at least 800-1,000 IU/day are required by adults living in temperate latitudes to achieve serum 25(OH)D levels of at least 80 nmol/L (36, 37).


The Adequate Intake (AI)

In 1997, the Food and Nutrition Board of the Institute of Medicine felt that the issue of sunlight exposure confounded the existing data on vitamin D requirements, making it impossible to calculate an RDA (28). Instead, the Food and Nutrition Board set adequate intake levels (AI) that assume no vitamin D is being synthesized in the skin through exposure to sunlight. The AI values established in 1997 (see table below) reflect vitamin D intakes likely to maintain serum 25(OH)D levels of at least 37.5 nmol/L, which many experts now feel is too low (2, 16, 17).





This is the Link to the Linus Pauling Institute -
Linus Pauling won two Nobels for his study's...

http://www.youtube.com/watch?v=ArkbEv0Q8D8
you may also watch "Linus Pauling" @ "youtube"
for you can watch him speak to an audience - he is very humourous brilliant man...