Vitamins and Minerals Reduced Cannabis and Cigarette Use When Started and Stopped in a Single Patient | Research

The takeaway

In a reversal design case study, a participant's cannabis and cigarette use decreased during micronutrient supplementation and resumed when supplements were stopped, across multiple on-off cycles.

Read this if you are interested in nutritional approaches to reducing substance use.

Cannabis and tobacco use tracked on-off with micronutrient supplementation across multiple cycles

What the researchers found

As part of a broader study of micronutrients for psychiatric symptoms (ADHD, depression, anxiety), researchers observed that a participant spontaneously reduced cannabis and cigarette use while taking vitamin and mineral supplements. Using a reversal design (off-on-off-on-off), they documented on-off control of both psychiatric symptoms and substance use across multiple cycles.

When micronutrients were consumed, cannabis and cigarette use decreased. When withdrawn, use resumed. This pattern repeated across cycles, despite substance use not being a treatment target. The researchers proposed that micronutrients may assist cessation by improving mood regulation and reducing anxiety, or by directly affecting brain reward circuitry through neurotransmitter precursors and cofactors.

Why it matters

The reversal design provides stronger evidence than a typical case report because the on-off pattern was replicated multiple times. While still a single case, the repeated association between micronutrient use and reduced substance use across multiple cycles suggests a real effect.

The numbers in context

Single participant. Reversal design: 5 phases (off-on-off-on-off). Cannabis and cigarette use decreased during micronutrient phases and increased during withdrawal phases. Pattern consistent across cycles.

How the study worked

Single-case reversal (ABAB) design. Participant took broad-spectrum micronutrients (vitamins and minerals) in an off-on-off-on-off pattern. Psychiatric symptoms and substance use assessed throughout. Substance cessation was not a treatment goal.

What this study cannot tell us

Single case cannot establish generalizability. No placebo control for supplement effects. The participant knew when they were taking supplements, introducing expectancy effects. Substance use changes could reflect other fluctuating life factors. The specific mechanisms are speculative.

How to read the evidence

Single case with reversal design; preliminary evidence stronger than typical case reports but still very limited.

When this study was published

Published in 2013. Research on nutritional interventions for substance use remains an emerging field.

The bigger picture

This observation aligns with research suggesting that nutritional deficiencies may contribute to substance use vulnerability. Micronutrients serve as precursors and cofactors for neurotransmitter synthesis, and optimizing these pathways could theoretically reduce the drive to use substances that artificially stimulate reward circuits.

Questions still open

Would this effect replicate in a controlled trial? Which specific nutrients are most important? Does nutritional status predict substance use treatment outcomes? Could micronutrient supplementation enhance existing addiction treatments?

Common questions

Can vitamins help you quit cannabis?

This single case showed a striking pattern where cannabis use decreased when taking vitamins and minerals and resumed when supplements stopped. However, one case cannot prove this works generally. The idea is biologically plausible because neurotransmitters that regulate mood and reward depend on vitamins and minerals for their production, but clinical trials are needed.

What type of supplements were used?

The participant took a broad-spectrum micronutrient formula containing primarily vitamins and minerals. This was not a single vitamin but a comprehensive supplement. Previous research with similar formulas had shown effects on ADHD, depression, and anxiety, and the substance use changes were an unexpected additional observation.

Read the original research

Use of micronutrients attenuates cannabis and nicotine abuse as evidenced from a reversal design: a case study.

Journal of psychoactive drugs, 45(2), 168-78

View on PubMed ↗

Citation

Harrison, Rachel; Rucklidge, Julia J; Blampied, Neville. (2013). Use of micronutrients attenuates cannabis and nicotine abuse as evidenced from a reversal design: a case study.. Journal of psychoactive drugs, 45(2), 168-78.