Herb Pharm Rehmannia Chinese — Kidney Nourishing Tonic | 1 fl oz
Prepared rehmannia (Rehmannia glutinosa radix praeparata — Shu Di Huang) is one of the most foundational herbs in the Chinese materia medica. The distinction between "prepared" (Shu Di Huang) and "raw" (Sheng Di Huang) rehmannia is pharmacologically significant: raw rehmannia is cooling, used for heat patterns and acute inflammatory conditions; prepared rehmannia (steamed nine times with rice wine in the classical method) is warming and tonifying, concentrated in the oligosaccharides, catalpol content, and acteoside that make it appropriate for long-term nourishing support of kidney yin and liver blood. Catalpol is an iridoid glycoside — research has shown it upregulates BDNF (brain-derived neurotrophic factor) in the hippocampus, providing neuroprotective effects studied in models of cognitive aging and neurodegeneration. Acteoside (verbascoside), a phenylethanoid glycoside, provides potent antioxidant and anti-inflammatory activity. Together these constituents underlie rehmannia's traditional role as a tonic for deep deficiency: low back and knee weakness (kidney yang/yin deficiency pattern), night sweats, tinnitus, and premature aging. Herb Pharm extracts from certified organic prepared rehmannia root.
Key Benefits
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Catalpol (Iridoid Glycoside) → BDNF Upregulation: Research shows catalpol increases BDNF (brain-derived neurotrophic factor) in the hippocampus — associated with neuroprotection and support for cognitive aging; the primary bioactive of Shu Di Huang beyond oligosaccharides
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Acteoside (Verbascoside): Phenylethanoid glycoside with potent antioxidant and anti-inflammatory activity — inhibits NF-κB signaling and protects against oxidative stress in multiple research models
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Shu Di Huang (Prepared) vs. Sheng Di Huang (Raw): Steamed with rice wine — transforms from cooling/blood-clearing to warming/blood-nourishing; increases oligosaccharide concentration and shifts the therapeutic profile to deep tonic support
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Kidney Yin & Liver Blood Tonic: The foundational herb for kidney yin deficiency in TCM — fatigue, low back weakness, night sweats, tinnitus, and early aging patterns
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HPA Axis & Adrenal Support: Research suggests rehmannia oligosaccharides modulate corticosterone output and support balanced stress hormone regulation
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Certified Organic | Liquid Extract: From organically grown Rehmannia glutinosa root | Fast absorption vs. dried capsules
How to Use
Add 20–40 drops to water or juice, 2–3 times daily between meals, or as directed by a practitioner. Best used as part of a tonic protocol — rehmannia is a foundational yin tonic, often combined with other herbs. Not a substitute for medical care.
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