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Falling oestrogen and testosterone levels can affect sexual desire and response

Supplement: Which is More Effective

10.1038/nn1626

Asprey, a cloud-computing executive turned biohacking guru, has built a $100 million empire around his DIY approach to performance enhancement, complete with two best-selling books, conferences, and stores that sell buttered coffee and supplements known as "smart drugs." Asprey runs his company, Bulletproof 360, remotely from a 32-acre farm on Vancouver Island, off Canada's Pacific coast

A handful of sensitive compounds, including NAD+ and certain antimicrobial peptides, are formulated to be mixed only with preservative-free sterile water because the benzyl alcohol in bacteriostatic versions can interfere with their stability

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