Adaptogens

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Upward Index: 02 - Compounds & Molecules MOC | Literature Dossier: Adaptogens - References

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1. Pharmacodynamics & Mechanism of Action

Adaptogens (a pharmacological class formalized by Nikolai Lazarev and Israel Brekhman, and mechanistically characterized by Alexander Panossian) are phyto-therapeutics that increase non-specific resistance to physical, chemical, and biological stressors by acting as mild stress-mimetics (eustressors) that flatten the apex of the acute stress response while preventing the exhaustion phase.

• Molecular Chaperones & HPA-Axis Homeostasis: Adaptogens upregulate Heat Shock Protein 70 (Hsp70) and Neuropeptide Y (NPY) while suppressing stress-activated JNK1 (c-Jun N-terminal kinase) and nitric oxide-induced ATP depletion. Under acute stress, JNK1 normally inhibits glucocorticoid receptors (GRs), impairing negative feedback and causing sustained hypercortisolemia; adaptogens inhibit JNK1, restoring nuclear GR sensitivity and normalizing CRH $\to$ ACTH $\to$ Cortisol flux.
• Rhodiola rosea (Salidroside & Rosavins): Standardized to $3\%$ rosavins / $1\%$ salidroside (SHR-5) or high-salidroside ($3\%$). Inhibits MAO-A and COMT weakly, increases cortical serotonin and dopamine availability, activates AMPK, and stimulates erythropoietin (EPO) and Hsp70 under hypoxic/fatigue loads.
• Ashwagandha (Withania somnifera — Withanolides): Steroidal lactones (Withaferin A, Withanolide D) act as ${\text{GABA}}_{\text{A}}$ receptor positive allosteric modulators and HPA-axis suppressors, reducing serum cortisol by $-15\text{ to }-30\%$, lowering GnRH inhibition to support luteinizing hormone (LH) and free testosterone, and increasing $T_4\to T_3$ thyroid deiodination.
• Panax ginseng (Ginsenosides Rg1, Rb1) & Cordyceps militaris (Cordycepin):
  • Rg1: Pro-dopaminergic, eNOS vasodilatory, and pro-LTP (stimulatory).
  • Rb1: Neuroprotective, GABAergic, and anti-inflammatory (calming).
  • Cordycepin ($3^{\prime }\text{-deoxyadenosine}$): Adenosine analog that activates AMPK, increases mitochondrial biogenesis (PGC-1$\alpha$), and enhances cellular oxygen utilization (${\text{VO}}_2\max$).

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2. Pharmacokinetics & Standardization Matrix

Botanical	Active Marker Standardization	Primary Bioavailability / Metabolic Factor	Autonomic Direction
Rhodiola rosea	$3\%$ Rosavins / $1\%$ Salidroside (or $3\%$ Salidroside)	Rapid oral absorption ($T_{\max }\approx 1\text{–}2\text{ h}$); bell-shaped dose-response curve ($>600\text{ mg}$ becomes sedating)	Ergogenic / Sympatho-stabilizing (AM)
Ashwagandha	KSM-66 ($5\%$ root withanolides) or Sensoril ($10\%$ root/leaf)	Lipophilic steroid lactones ($t_{1/2}\approx 6\text{–}12\text{ h}$); KSM-66 is less sedating than high-withaferin Sensoril	Parasympathetic / Anxiolytic (PM)
Panax ginseng	$5\text{–}20\%$ Ginsenosides (or fermented GS-E3D / Compound K)	Native ginsenosides have poor absorption ($<5\%$) until cleaved by gut microbiota into Compound K	Balanced / Pro-erectile & Cognitive
Cordyceps militaris	$>1\%$ Cordycepin + $>25\%$ $\beta$-glucans (fruiting body)	Rapid absorption; deaminated by Adenosine Deaminase (ADA) unless paired with pentostatin/polyphenols	Aerobic / Mitochondrial ATP
Schisandra chinensis	$2\text{–}9\%$ Schisandrins (Schisandrin B)	Hepatic Phase I/II modulation and mitochondrial glutathione induction	Hepato- & Neuro-adaptogenic

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3. Dosing, Cycling & Synergies

• Standard Protocol:
  • Morning Ergogenic Stack: $200\text{–}400\text{ mg}$ Rhodiola rosea (fasted AM) + $1,000\text{–}2,000\text{ mg}$ Cordyceps militaris fruiting body extract.
  • Evening Cortisol-Blunting Stack: $300\text{–}600\text{ mg}$ Ashwagandha (KSM-66) or $125\text{–}250\text{ mg}$ Sensoril taken with dinner or post-workout (avoid waking AM dosing if cortisol awakening response [CAR] blunting or lethargy occurs).
• Cycling Cadence: Essential to cycle adaptogens to prevent receptor adaptation or emotional blunting:
  • Ashwagandha: Cycle 6–8 weeks on, 2–4 weeks off (chronic uncycled use can downregulate $5{\text{-HT}}_{1\text{A}}$ signaling and induce $5{\text{-HT}}_{2\text{A}}$/dopaminergic anhedonia in susceptible individuals).
  • Rhodiola rosea: 5 days on / 2 days off, or 6 weeks on / 2 weeks off.
• Contraindications & Biomarkers to Monitor:
  • Contraindications: Ashwagandha is contraindicated in hyperthyroidism / Graves’ disease (can precipitate thyrotoxicosis via $T_4/T_3$ elevation), nightshade (Solanaceae) hypersensitivity, and pregnancy; rare idiosyncratic cholestatic/hepatocellular liver injury has been reported with contaminated or high-dose extracts.
  • Biomarkers: 4-Point Salivary / Diurnal Cortisol Curve (CAR), DHEA-S, Free T3 / Free T4 / TSH, ALT/AST, and Free Testosterone.

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4. Key Scientific Evidence Summary

• Ashwagandha & Serum Cortisol RCT: Chandrasekhar et al. (2012) demonstrated in a 60-day double-blind RCT ($N=64$) that $300\text{ mg}$ twice daily KSM-66 Ashwagandha reduced Perceived Stress Scale (PSS) scores by $-44.0\%$ and reduced serum cortisol by $-27.9\%$ ($p=0.0006$).
• Rhodiola rosea in Night-Duty Physicians: Darbinyan et al. (2000) showed in Phytomedicine ($N=56$) that $170\text{ mg/day}$ SHR-5 Rhodiola rosea extract significantly prevented night-shift cognitive fatigue and improved total mental performance index by $+20\%$ ($p<0.01$).
• Molecular Chaperone Mechanism: Panossian et al. (2009, 2010) established that adaptogen combinations (ADAPT-232: Rhodiola, Schisandra, Eleuthero) stimulate circulating Hsp72 and NPY to protect cellular bioenergetics under acute stress.

See full study breakdowns in Adaptogens - References.