I received the following email:

Dear Mr. Lassesen,
As I am highly deficient in the following bacteria:

– Akkermansia
– Lactobacillus
– Roseburia
– Bifidobacterium
– Eubacterium

and pretty deficient in these two:

– Faecalibacterium
– Blautia

, I wanted to ask you for the best probiotic brands?

Another question would be: Is it beneficial to take prebiotics as well? And if not, why not?
Many thanks in advance for your help!

My answer is very simple and below:

 the best solution is to use the AI.
Go to http://microbiomeprescription.com/labs/definition?key=T And for each item above  mark them as down, 50% (exact amount is not important)

Then Click [Analysis] at the bottom of the page. This will takes you to a page like this:

Change choices as desired. It will then give suggestions based on the estimated probability of them making a change (not the amount of change, the probability of change).

There is a section on probiotics by commercial name.

Above that are specific items like prebiotics by explicit type. Some prebiotics may be on the avoid list. What is suggested with this combination of bacteria is partially below

This is generated by artificial intelligence based on a large set of facts obtained from gold-standard sources (studies on PubMed, KEGG, etc).

Data Store	Count
Microbiome with Symptoms	683
Citations	1,955
EndProducts-to-Bacteria Relationships	8,223
Enzymes	6,136
Enzymes to Bacteria	5,396,780
KEGG Module to Bacteria	274,712
KEGG Modules	419
Medical Condition to Bacteria Associations	4,306
Modifier-to-Bacteria relationships	1,045,918
Modifiers of bacteria	1,963
Probiotic Mixtures	224