Vitamin D
†1 https://www.ncbi.nlm.nih.gov/pubmed/19176352
‡ This research details the specific role that vitamin D may play in energy metabolism. More research into this area is required.
Riboflavin
†2 https://www.ncbi.nlm.nih.gov/pubmed/10450194
‡ Completed over 6 weeks, more time is warranted for stronger results.
Folate and Vitamin B12
†3 https://www.ncbi.nlm.nih.gov/pubmed/10767667
‡ The supplementation did produce results, but only after several months. Longer periods of time may be needed.
Magnesium
†4 https://www.ncbi.nlm.nih.gov/pubmed/1672392
‡ This study tested the efficacy of intramuscular magnesium sulphate against a placebo. A wider population study will provider a stronger conclusion.
Organic KSM-66® Ashwagandha Extract
†5 https://www.ncbi.nlm.nih.gov/pubmed/10956379
‡ This extract has multi-properties that depend on the health and age of a person.
†6 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3252722/
‡ Larger scaled studies are needed.
Rhodiola Extract
†7 https://www.ncbi.nlm.nih.gov/pubmed/22643043
‡ This meta-review looked at 206 different articles to try and determine whether rhodiola is effective as a fatigue treatment. Only 11 of the articles qualified for consideration; the others did not meet the researchers’ criteria for inclusion in the review.