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Bryan Johnson, a tech entrepreneur who is known as the anti-ageing millionaire, was experimenting with a drug named rapamycin. It was believed that the drug could increase the lifespan of mice upto 14 %. 
A human trial done showed participants who took the drug feeling healthier than before. This gave Bryan Johnson hopes to experiment with it but he began noticing a series of unsettling side effects that included mouth ulcers, delayed wound healing, elevated cholesterol levels as well as spikes in blood sugar. One of the most unsettling symptoms was the persistent rise in his resting heart rate.
His doubts were reaffirmed by a recent study by Yale University that showed that rapamycin could actually increase ageing.Bryan Johnson has now stopped taking the drug and emphasized that it is not a defeat but a strategic pivot.
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