The standard valerian extract is typically an aqueous-ethanolic (30:70) extract derived from the roots, which usually has a herb-to-extract ratio in the range of 4-7:1 herb:extract (by dry weight of plant matter) and is standardized to contain 0.8% valerenic acid.[1]
References
- ^Barton DL, Atherton PJ, Bauer BA, Moore DF Jr, Mattar BI, Lavasseur BI, Rowland KM Jr, Zon RT, Lelindqwister NA, Nagargoje GG, Morgenthaler TI, Sloan JA, Loprinzi CLThe use of Valeriana officinalis (Valerian) in improving sleep in patients who are undergoing treatment for cancer: a phase III randomized, placebo-controlled, double-blind study (NCCTG Trial, N01C5)J Support Oncol.(2011 Jan-Feb)