I am a 57 year old female my vitamin d is 28 my platelet count is 124 could the low vitamin d be causing low platelet?

No, Vitamin D has no relationship with Platelet count. If your ethnicity is not white, vitamin D level is considered normal. On general, vitamin D level is between 30-100 but that is not race based. Most black people has D level less than 20 and Asian or Hispanic people in America have D level less than 30 if they are not taking D supplement. Per ACIM, vitamin D level above 20 is normal.

Correlations?: As Dr Le states, there is no relationship between platelets and low vitamin D. Would suggest you supplement with 2,000 units vitamin D-3 daily to boost your level upwards, and recheck levels in 3 months. Might be important to serially follow your platelet counts. A hematologist might be helpful.