Biotest liquid vitamin D drops

This supplement by Biotest was genuinely recommended once in the episodes we index, on Tim Ferriss. The people who vouched for it on air: Christopher Sommer. It comes up in conversations about exercise & strength, longevity & aging. Every quote below is verbatim, attributed, and linked to the exact second it was said. Sourced expert opinion, not medical advice.

• “I want to say it was Biotest perhaps I can't swear about other ones I just know I've always used that particular one”

  Why it counts as a recommendation: “the only thing that changed in that time was the vitamin D ... that's the doorstep I put it at”
  Christopher Sommer · The Tim Ferriss Show · Jun 202403:09:00

  Said during "Pavel Tsatsouline and Chris Sommer, The Tim Ferriss Show". The episode features Pavel Tsatsouline and Christopher Sommer: Pavel Tsatsouline is the founder and CEO of StrongFirst, the strength coach who brought the Russian kettlebell to the West; Christopher Sommer is a former US national team gymnastics coach and founder of the Gymnastic Bodies training system. Two strength legends, Pavel Tsatsouline and Christopher Sommer, explain why strength is a skill and patience builds bodies that last.