For this particular situation on D3 I personally (who is not your doctor) would go with vitamin D3-loaded nanoemulsion. The reason is that Vit D influences how tryptophan is converted down the 5-HTP and serotonin path or the Kynurenine path. We want higher serotonin AND specifically in the brain. The higher serotonin means better melatonin which not only increase sleep, but increase the ERα expression which we are trying to increase... in the brain.

There is a recent study on this showing how this form can provide better results in the brain. https://www.sciencedirect.com/science/article/pii/S305047402...

In general: Omega-3, bcomplex with choline etc all have studies. Really it depends on the individual and what their genetic weakest issue is. Its old and boring, but eat healthy, don't eat before bed, exercise (dance!), and get good sleep always apply.