Please assess the completion status of the following clinical trial:

Trial Title: An Evaluation of the Effect of Vitamin D Supplementation on the Cognitive Function of Older Subjects With Low Levels of This Vitamin

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Adults aged 65 years and older.~* Level of vitamin D (25-OH vitamin D) is less than 30 ng / ml.~* Stable health status as assessed by the treating primary care physician.~* Do not take antidepressant medications.~* Do not take supplements containing vitamin D.~* Normal cognitive function as determined by MoCA Test screening and clinical assessment~* Adequate literacy to enable the performance of assessment instruments~* Provide informed consent as required by the Ethics Committee.~Exclusion Criteria:~* Age younger than 65 years~* Health status not stable as determined by the treating primary care physician~* Cognitive impairment or dementia~* Illiteracy~* Taking supplements containing Vitamin D~* Taking antidepressant medications~* Significant visual or hearing impairment not corrected by spectacles or hearing aids~* Impaired competency limiting the subject's ability to provide informed consent

- Gender: ALL
- Minimum Age: 65 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Intervention group- vitamin D (Type: EXPERIMENTAL): Include patients aged 65 years and older that are found to have below-normal serum levels of vitamin D on routine laboratory testing. After providing informed consent (the study was submitted for approval by the Ethics Committee of the Clalit Health Services) eligible subjects will undergo cognitive and affective assessment

Based on this trial design, predict the completion outcome and termination type (if applicable).