Ashwagandha (KSM-66)

AdaptógenoDosis clínica: 300–600mg/day (KSM-66 extract)Tiempo de efecto: 2–4 weeks for anxiety/stress; 4–8 weeks for cognitive effects

Mecanismo de Acción

Ashwagandha (Withania somnifera) is an Ayurvedic adaptogen. Its withanolides modulate the HPA axis to reduce cortisol, while also inhibiting acetylcholinesterase (preserving acetylcholine) and promoting GABA receptor activity for anxiolytic effects. KSM-66 is the most studied full-spectrum root extract.

Resumen de Evidencia Clínica

A 2019 RCT (Choudhary et al.) found KSM-66 at 300mg twice daily significantly improved memory, attention, and information processing speed versus placebo over 8 weeks. A 2012 RCT showed 27.9% reduction in cortisol. KSM-66 has the most clinical trials of any ashwagandha extract (>24 gold-standard studies).

Matriz de Efectos en Humanos

Basado únicamente en ensayos clínicos en humanos. Se excluyen datos en animales e in vitro.

Efecto	Evidencia	Magnitud	Estudios	Notas
Cortisol Reduction	●●● Fuerte	Grande	11	27.9% cortisol reduction (Chandrasekhar 2012) is one of the largest effect sizes in the adaptogen literature.
Anxiety & Stress	●●● Fuerte	Grande	10	Consistently significant in both clinical anxiety populations and healthy high-stress subjects.
Sleep Quality	●●○ Moderado	Moderado	6	Reduces sleep latency and improves sleep quality ratings, likely via GABA modulation and cortisol reduction.
Cognitive Function Under Stress	●●○ Moderado	Moderado	5	Memory and processing speed improvements are most pronounced in stressed or sleep-deprived subjects, not rested baseline.

Clave de evidencia: ●●● Fuerte = múltiples ECAs consistentes | ●●○ Moderado = ECAs más pequeños/escasos | ●○○ Preliminar = ensayos tempranos o muestra pequeña | ◐◐○ Mixto = resultados contradictorios

Beneficios Documentados

✓Cortisol reduction
✓Cognitive function under stress
✓Sleep quality
✓Muscle strength and recovery

Efectos Secundarios y Precauciones

!Generally safe
!GI upset in some users
!Contraindicated in thyroid conditions
!Avoid during pregnancy

Cómo Tomar

Dosis300–600mg/day (KSM-66)

MomentoEvening (1–2 hours before bed) for sleep benefits. Morning for cortisol and stress management. Split dosing (300mg AM + 300mg PM) is used in the most comprehensive trials.

Con AlimentosTake with food to minimise GI upset (particularly with 600mg doses). Absorption is not significantly affected by food.

FormasCapsule. Insist on KSM-66 (full-spectrum root extract, 5% withanolides) or Sensoril (leaf + root, 8% withanolides, lower dose needed). Avoid unstandardised ashwagandha with no withanolide percentage stated — active content may be negligible.

Recomendaciones de Combinación

Ingredientes que combinan bien con Ashwagandha (KSM-66) y por qué.

Rhodiola Rosea

The canonical adaptogen duo. Rhodiola is activating (morning); Ashwagandha is calming (evening). Both target HPA axis dysregulation but through different mechanisms and at different times of day — a perfect day/night pair.

L-Theanine

Both reduce anxiety through distinct mechanisms (HPA axis modulation vs. alpha-wave induction). L-Theanine provides immediate calm; Ashwagandha provides systemic, longer-term stress reduction. Together they work at multiple timescales.

Phosphatidylserine

Both independently reduce cortisol via different pathways (HPA modulation vs. cortisol receptor sensitivity). The combination may provide additive cortisol reduction under high-stress conditions.

Preguntas Frecuentes

KSM-66 vs Sensoril vs generic ashwagandha — which should I choose?▾

KSM-66 (5% withanolides from root only) has the largest body of clinical evidence — over 24 gold-standard trials. Sensoril (8% withanolides from root + leaf, lower dose needed at 125–250mg) has good evidence specifically for stress and sleep. Generic ashwagandha without a stated withanolide percentage is unreliable — you may be paying for starchy root powder with minimal active content. Choose KSM-66 or Sensoril.

Will ashwagandha make me tired during the day?▾

No — at morning doses, most people experience calm focus, not sedation. The tiredness effect is most pronounced when taken at night, where it reduces sleep latency. Ashwagandha doesn't deplete energy; it reduces the cortisol-driven hyperarousal that causes fatigue. Some people find 600mg in the morning slightly sedating — if so, reduce to 300mg or shift to evening only.

Is ashwagandha safe for long-term use?▾

Most trials run 8–12 weeks with clean safety profiles. Ayurvedic traditional use spans millennia. No serious adverse events at KSM-66 doses in trials. Some practitioners recommend a 4-week break every 3 months as a precaution, though no evidence specifically requires this. Avoid if you have thyroid conditions (autoimmune thyroid disease) as withanolides can modulate thyroid hormone levels.

Can ashwagandha increase testosterone?▾

Yes — multiple RCTs show KSM-66 increases testosterone by 15–17% in healthy men, particularly in those under stress or with sub-optimal testosterone at baseline. A 2015 study in infertile men found more dramatic increases. The mechanism is likely via cortisol reduction (cortisol suppresses testosterone). This is a real, replicated effect, though the magnitude varies by individual.