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He says that Aseir, a company he founded to sell a hair regrowth bioregulator product, was completely blocked by Big Pharma in its ad efforts because in the cold traffic space of Facebook and Google and now Instagram, they would not allow any kind of peptide-based hair regrowth product to gain any kind of market for more penetration. Campbell says that Big Pharmas influence and insane amounts of money has given it a lot of control over cold traffic marketing

Some groups are more likely to experience low B12 levels, even without major health issues

Still, it helps to understand why some people eventually explore broader combination approaches

doi: 10.1038/s41571-019-0181-9