Most ashwagandha supplements are labeled for adults 18 and older, but there is no universal legal minimum age. The 18-year cutoff on most product labels is a manufacturer convention, not a regulation. Clinical research has tested ashwagandha in children as young as 6, though the body of evidence in younger age groups is far thinner than it is for adults.
What Supplement Labels Typically Say
Walk through any supplement aisle and you’ll see ashwagandha products marked for adults aged 18 to 50, with a standard warning that children under 18 should talk to a doctor first. This language isn’t mandated by the FDA in the way a prescription drug’s age restriction would be. Supplement makers set their own target age ranges, and most default to 18 because that’s where the bulk of clinical trial data exists. Neither the NIH nor the European Medicines Agency has published an official minimum age for ashwagandha.
Research in Children Ages 6 to 12
One randomized, placebo-controlled trial gave ashwagandha root extract gummies (150 mg twice daily) to healthy children aged 6 to 12 for eight weeks. No serious adverse events were reported, no child dropped out because of side effects, and the mild issues that did come up occurred at similar rates in the ashwagandha and placebo groups. The researchers concluded the supplement was well tolerated and saw improvements in cognitive performance and sleep quality. That said, a single eight-week study of 85 children is a small evidence base. No comparable trials have been published for teenagers specifically.
Why the Teenage Years Raise Extra Questions
Ashwagandha interacts with several hormone pathways that are especially active during puberty. It influences the system connecting the brain to the adrenal glands (the stress-hormone axis) and the system connecting the brain to the reproductive glands (the sex-hormone axis). In practical terms, ashwagandha can lower cortisol levels while raising luteinizing hormone, follicle-stimulating hormone, and testosterone. For adults dealing with chronic stress or low testosterone, those shifts may be welcome. For a teenager whose endocrine system is still calibrating itself through puberty, the implications are less clear.
Some researchers have noted that compounds in ashwagandha root act similarly to adrenal steroids, which has led to its reputation as a “growth promoter” during development. Whether that effect is beneficial, neutral, or disruptive for an adolescent going through normal hormonal changes hasn’t been studied directly. This gap in the research is a major reason most manufacturers stick with the 18-and-over label.
Typical Adult Dosages
In clinical trials with adults, ashwagandha root extract is most commonly used at 300 mg twice daily (600 mg total per day), taken for 8 to 12 weeks. Dosages across published studies range widely, from 120 mg to 2,000 mg daily, depending on the form (raw root powder vs. concentrated extract) and the condition being studied. The children’s trial used a lower dose of 150 mg twice daily (300 mg total). No standardized pediatric dosing chart exists.
The NIH notes that ashwagandha appears well tolerated for up to about three months, but its long-term safety has not been established in any age group.
Benefits for Older Adults
At the other end of the age spectrum, ashwagandha has been studied in adults aged 60 to 85. A 12-week trial using 600 mg per day in this group found significant improvements in overall quality of life, sleep quality, and mental alertness compared to placebo. No participants dropped out due to side effects. Ashwagandha has also shown benefits for muscle strength, cardiorespiratory endurance, and mild cognitive impairment in aging populations. For older adults, the hormonal effects that raise questions in teens (like modest testosterone increases) can actually work in their favor.
Who Should Avoid It at Any Age
Certain groups should skip ashwagandha regardless of how old they are:
- Pregnant or breastfeeding women. Some reports suggest it may increase the risk of spontaneous abortion.
- People with autoimmune or thyroid disorders. Ashwagandha can stimulate the immune system and alter thyroid hormone levels.
- People with hormone-sensitive prostate cancer. Because ashwagandha can raise testosterone, it may fuel tumor growth.
- Anyone about to have surgery. Its effects on the central nervous system and hormone levels could complicate anesthesia or recovery.
In 2024, France’s national health and safety agency formally recommended against ashwagandha use in pregnant and breastfeeding women and in people with endocrine disorders.
The Practical Bottom Line on Age
If you’re 18 or older and otherwise healthy, ashwagandha falls within the age range supported by the largest body of clinical evidence. If you’re considering it for a child or teenager, the safety data is extremely limited. One trial in children aged 6 to 12 showed no red flags over eight weeks, but no studies have tracked what happens with longer use during key developmental windows like puberty. The hormonal activity of ashwagandha, particularly its effects on stress hormones, reproductive hormones, and growth signaling, makes the lack of adolescent data worth taking seriously.