Studies examining supplement quality find contamination rates of 12-58% in ergogenic supplements, with 30% containing incorrect amino acid sequences and 65% exceeding safe endotoxin thresholds
Some of the best sources of vitamin B12 include meat, fish, eggs, fortified foods, and supplements
10.1038/jcbfm.2014.109 J
Distinction between Acute and Chronic Effects: Relevant systematic reviews indicate that cognitive improvement is usually observed close to the time of administration in a "learning or memory retention test." This refers to the timing of the experiment, where the drug must intervene in the memory consolidation process, rather than the subjective experience that the subject can immediately feel
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