Nature's Truth Ashwagandha review: can it help with cortisol?

Cortisol is the body's main stress hormone, and when it stays high for long periods it tends to work against testosterone. That is why ashwagandha, a root used in Ayurvedic practice for centuries, has become one of the most popular supplements for men. This review looks at what the research actually shows, and whether this particular Nature's Truth capsule matches it.

What is in this product

According to the Amazon listing, two capsules provide 300 mg of a 10:1 ashwagandha root extract (marketed as "equivalent to 3,000 mg" of raw root) plus 12 mg of black pepper extract. Other ingredients are rice powder, a gelatin capsule, magnesium stearate and silica. A bottle holds 90 capsules.

Two things are worth knowing. The big "3000 mg" number describes how much raw root the extract was made from, not how much extract you get. And the label does not name a tested extract or state a withanolide content, which is the usual way quality ashwagandha extracts are standardised. The gelatin capsule also means it is not vegetarian.

What the studies found on stress and cortisol

Chandrasekhar and colleagues (2012) ran a 60-day double-blind placebo-controlled trial in 64 stressed adults using a standardised root extract (KSM-66). The ashwagandha group reported lower stress scores and had significantly lower blood cortisol than the placebo group.

Lopresti and colleagues (2019) tested a different extract (Shoden) in 60 stressed adults for eight weeks. Morning cortisol fell more in the ashwagandha group, and in men the researchers also saw a modest rise in testosterone and DHEA compared with placebo, though self-reported anxiety did not differ much between groups.

Salve and colleagues (2019) gave 60 healthy adults either placebo or one of two amounts of root extract for eight weeks. Both ashwagandha groups showed lower stress scores and lower cortisol, with the larger amount doing better.

Chauhan and colleagues (2022) studied 50 men reporting low sexual desire. The root extract group had better sexual-function scores and a significant change in testosterone compared with placebo.

How to read these results

These are real randomised trials, and their direction is consistent: ashwagandha root extract may help lower perceived stress and cortisol in stressed adults. But the trials are small, short (eight weeks or so), often funded by extract makers, and each tested one specific branded extract. Nobody has tested this Nature's Truth product, so it may or may not behave the same way.

The testosterone changes reported were modest, mostly in men who were stressed or had symptoms to begin with. Ashwagandha is best thought of as a possible help with stress, not as a testosterone booster. Sleep, training and body fat still matter far more.

Safety

Most trials reported few side effects, typically mild stomach upset or drowsiness. However, the NIH's LiverTox database records rare cases of liver injury linked to ashwagandha. It may also interact with thyroid, sedative, blood-sugar and blood-pressure medicines and immune-suppressing drugs, and it is not appropriate in pregnancy. Speak to a doctor or pharmacist before trying it, especially if you take any medication or have a thyroid, liver or autoimmune condition. Stop and seek advice if you notice yellowing skin or eyes, dark urine or unusual tiredness.

Verdict

If you want to try ashwagandha for stress, this is a straightforward single-ingredient option with an extract amount in the range trials have used. If you would rather match the research as closely as possible, a product that names a tested extract such as KSM-66 is a stronger choice. Either way, expect a small effect at best, and treat it as a supplement to good sleep and stress habits, not a replacement for them.

This review summarises published research and the manufacturer's listing. It is not medical advice.