Please assess the completion status of the following clinical trial:

Trial Title: Effects of Vitamin D on Moderate to Severe Periodontitis

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: FACTORIAL
- Observational Model: None
- Primary Purpose: SUPPORTIVE_CARE
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~1. Age from 30 years old to 70 years old~2. More than 20 teeth remaining in the mouth~3. Clinical diagnosis of moderate to severe periodontitis~4. Not receiving periodontal treatment within 6 months~5. Not taking antibiotic drugs within 3 months.~Exclusion Criteria:~1. Diabetes, thyroid and parathyroid endocrine associated diseases~2. Severe systemic diseases, such as cancer~3. Taking vitamin D and / or calcium drugs during observation~4. Taking aspirin, non-steroidal anti-inflammatory drugs, and steroids~5. Pregnant or prepare to pregnant within one year~6. Have been suffering from hypercalcemia, malabsorption syndrome.

- Gender: ALL
- Minimum Age: 30 Years
- Maximum Age: 70 Years
- Healthy Volunteers: f

Study Arms:
- 2000IU/day (Type: EXPERIMENTAL): Subjects took 2000IU vitamin D per day
- 1000IU/day (Type: EXPERIMENTAL): Subjects took 1000IU vitamin D per day
- Placebo (Type: PLACEBO_COMPARATOR): Subjects took placebo

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