Biohacking & HealthSpan

To buy grass fed butter in an affordable way (without spending $7-8 per block on something that says "grass fed" on the label) is an exercise in risk management. The risks are that the cows could get fed grain:

• As their primary food source
• As a backup food source (in winter or drought when there's no grass)
• As a treat to produce their milk 

So the trick is to find products that tick (or don't tick) the above boxes.