My mother has vascular dementia.

She will be receiving personalized aromatherapy at her care facility.

I have ordered a diffuser and the essential oils rosemary, bay laurel, and lemon balm.

The poster known as Lane Simonian previously told me in this forum that these oils are good for cognition and that lemon balm is also good for relaxation.

I have a few questions about the best way to administer the aromatherapy.

1) Should all three of these oils be put into the diffuser at the same time?

2) Or should the diffuser work with just one oil at a time? (For example, put rosemary into the diffuser for a few days, and then put bay laurel into the diffuser for a few days, and then put lemon balm into the diffuser for a few days.)

Thank you in advance for any information.

I am glad that your mother will be receiving aromatherapy.

Some essential oils don't mix well together--they can produce a terrible smell.  I am not sure if this will be the case for rosemary, lemon balm, and bay laurel.  I don't think that it will impact the effectiveness of the essential oils (some companies do mix essential oils together for aromatherapy).  So you could try to mix the oils in the diffuser and see how it works.

I don't know this for sure but aromatherapy and CBD oil (under the tongue, for instance) should work effectively for vascular dementia.