| 2C-B | detectable on specialised hair testing |
| 2C-I | detectable on specialised testing |
| 4-AcO-DMT | limited data |
| Adderall / amphetamines | up to 90 days |
| Alcohol | EtG segment analysis covers roughly the past 90 days |
| Ambien (zolpidem) | up to 90 days (rare) |
| Anabolic steroids | experimental |
| Ashwagandha | n/a |
| Baclofen | n/a |
| Barbiturates | up to 90 days |
| Benadryl / NyQuil (diphenhydramine & doxylamine) | n/a |
| Benzodiazepines (Xanax, Valium, Klonopin, Ativan) | up to 90 days |
| Buspirone (BusPar) | n/a |
| CBD (cannabidiol) | not tested |
| Clonidine | n/a |
| Coca (leaf and tea) | up to 90 days |
| Cocaine | up to 90 days |
| Codeine / promethazine ('lean') | up to 90 days |
| Creatine | n/a |
| DMT | theoretical |
| DXM (dextromethorphan) | rarely relevant |
| Delta-10 THC | up to 90 days |
| Delta-8 THC | up to 90 days |
| Dilaudid (hydromorphone) | up to 90 days |
| Escitalopram (Lexapro) | n/a |
| Etizolam | detectable on specialised testing |
| Fentanyl | up to 90 days (specialized) |
| Fluoxetine (Prozac) | n/a |
| GHB | up to 90 days on specialised hair testing |
| Gabapentin (Neurontin) | rarely tested |
| Hemp | n/a for seed or fibre |
| Hydrocodone (Norco, Vicodin) | up to 90 days |
| Hydroxyzine (Atarax/Vistaril) | n/a |
| K2 / Spice (synthetic cannabinoids) | up to 90 days (specialized) |
| Kava | n/a |
| Ketamine | up to 90 days (specialized) |
| Khat (cathinone) | detectable on specialised testing |
| Kratom (mitragynine) | up to 90 days (rarely offered) |
| LSD (acid) | 90 days; commercial availability rare |
| Lidocaine | n/a |
| MDMA (ecstasy/molly) | up to 90 days |
| MDPV | detectable on specialised testing |
| Melatonin | n/a |
| Mescaline (peyote) | detectable on specialised testing |
| Methadone | up to 90 days |
| Methamphetamine | up to 90 days |
| Methylphenidate | up to 90 days (specialized) |
| Modafinil | rarely tested |
| Morphine | up to 90 days |
| Muscle relaxers (Flexeril, Soma, tizanidine) | n/a |
| NBOMe (25I-NBOMe) | detectable on specialised testing |
| NSAIDs (ibuprofen, naproxen, ketorolac) | n/a |
| Naltrexone | rare |
| Nicotine (smoking/vaping/Zyn) | 1–3 months |
| Nitazenes | detectable on specialised testing |
| Nitrous oxide | not detected |
| NyQuil & cold medicines | n/a |
| Ondansetron | n/a |
| Opiates / opioids (heroin, morphine, codeine) | up to 90 days |
| Opium | up to 90 days |
| Oxycodone (Percocet, OxyContin) | up to 90 days |
| Ozempic / GLP-1 (semaglutide) | n/a |
| PCP (angel dust) | up to 90 days |
| Peptides (BPC-157, ipamorelin) | n/a |
| Phenibut | limited data |
| Phentermine (Adipex-P) | up to 90 days |
| Poppers (alkyl nitrites) | n/a |
| Pregabalin (Lyrica) | rarely tested |
| Psilocybin mushrooms ('shrooms') | detectable in theory for 90 days, but psilocybin hair testing is rarely offered commercially |
| Quetiapine (Seroquel) | n/a |
| Salvia divinorum | n/a |
| Sertraline (Zoloft) | n/a |
| Sildenafil | n/a |
| Suboxone (buprenorphine) | up to 90 days (specialized) |
| Sudafed (pseudoephedrine) | n/a |
| Synthetic cathinones (bath salts) | detectable on specialised testing |
| Tianeptine | limited data |
| Tramadol (Ultram) | up to 90 days (specialized) |
| Trazodone | n/a |
| Weed / THC (cannabis) | up to 90 days (standard head-hair window) |
| Wellbutrin (bupropion) | n/a |
| Wild lettuce (lactucarium) | n/a |
| Xylazine | detectable on specialised hair testing |
| alpha-PVP (flakka) | detectable on specialised testing |
