Pick one anchor time
The single biggest predictor of whether a daily supplement habit survives is whether it is attached to something you already do. Breakfast is the most common anchor because it happens at roughly the same time every day. If you skip breakfast, pick another fixed point: the moment you sit down at your desk, or the last thing before you leave the house. What matters is that the anchor is a daily event, not a mood. "When I remember" is not an anchor.
Write the anchor down next to the product name. If the two never share a sentence, the routine will drift within the first fortnight — and you will blame the product instead of the timing.