Australian Naturalcare recommends taking the Vitamin D3 with meal in the evening. 

In general, the best time to take Vitamin D3, ultimately depends on your personal preference and lifestyle. There is no specific scientific evidence suggesting that one time of day is superior to the other for taking Vitamin D3. However, here are some considerations to help you decide:

1. Scheduling and convenience: Consider which time of day works best for you in terms of consistency and convenience. Taking your Vitamin D3 supplement when you're most likely to remember and adhere to your routine can be beneficial. You may find it more convenient to take it in the morning, alongside breakfast or other morning medications, or at night, alongside your evening routine.
2. Interactions with other medications or supplements: If you take other medications or supplements that have specific timing recommendations, it's important to consider potential interactions. Some medications or supplements may require specific timing to optimise absorption or avoid interactions. In such cases, consult with a healthcare professional to ensure proper scheduling of all your supplements and medications.

Vitamin D and vitamin D3 are often used interchangeably, but they are not exactly the same.

1. Vitamin D: This is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and multiple other biological effects. There are two main forms: vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol).
2. Vitamin D3: Also known as cholecalciferol, it's one of the forms of vitamin D. Vitamin D3 is naturally produced in the skin when it's exposed to sunlight. It's also found in some foods, particularly animal-based ones like fatty fish and egg yolks. D3 is often considered more effective at raising vitamin D levels in the blood compared to D2, which is usually obtained from fortified foods and supplements.