You can find numerous studies that provide scientific evidence for the ingredients we rely on (for each specific vitamin and mineral component) in our Scientific Resources.
The relationship between these ingredients and the effects we claim (such as support of concentration, cognition, energy, memory and mental performance) has been investigated and recognised by EFSA (the European Food Safety Authority), as shown by the articles in the page link above.
These claims are compliant with statutory regulations enforced by the Department of Health (UK), Medicines and Healthcare products Regulatory Agency (UK), Food Standards Agency (UK), City of Edinburgh Environmental Health (Scotland), Trading Standards (Scotland) and the European Food Safety Authority (EU).