Figure 1From: Silicon balance in human volunteers; a pilot study to establish the variance in silicon excretion versus intakeStudy design. Summary of the timing of ingestion of the test solutions (Si-supplement or ultra-high purity water; Si/H 2 O shown by thick black arrow ) and standardised meals ( down arrows ), and the collection of serum ( thin up arrows ), urine and faecal samples (collection periods indicated). Pre-dose (baseline; light grey) and post-dose (dark grey) collections are indicated.Back to article page