Meet the Plant Man

Goldthread founder William Siff is a licensed acupuncturist, clinical herbalist, and lifelong ethnobotanical explorer.

His mission: to reconnect people with the power of plants.

For over 20 years, William has worked to raise awareness around plant-based wellness — not with trends, but with time-tested superherbs, adaptogens, and spices that offer real, tangible benefits.

Goldthread tonics are the result of that mission: refreshing, functional drinks formulated to support the body’s core systems — and to make feeling good part of everyday life.

From Farm to Bottle

Farm to bottle isn’t a slogan — it’s the root of everything we do.

William’s approach to plant medicine starts where the plants do: in the soil, with the people who’ve cultivated them for generations. He’s traveled the world to build direct relationships with small-scale farmers who grow the most potent, pure medicinal herbs available — always sustainably, always with intention.

These aren’t bulk commodity ingredients. They’re harvested at peak vitality, grown in harmony with the land, and micro-brewed to preserve their full spectrum of benefits. When we say we know where our herbs come from — we mean it. Literally. William is probably texting one of our farmers right now.

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Plants + People

William began by using plant medicine in clinical practice, creating custom tonic blends to support core systems like energy, immunity, digestion, and sleep. Over time, patterns emerged — no matter their background, people needed support in the same foundational ways.

That insight became the blueprint for Goldthread: targeted formulas made with powerful herbs that help anyone — whether managing chronic symptoms or simply seeking to feel stronger, clearer, and more balanced every day.

The Goldthread Timeline

  • First Goldthread Apothecary opens in Northampton, MA offering plant-based alternative healthcare at a local and accessible level.

    2001

  • Goldthread expands and opens second apothecary in MA.

    2004

  • Goldthread farm opens in Conway, MA growing over 100 varieties of medicinal plants.

    2006

  • Farm to Pharmacy program begins at Goldthread Farm, a unique and hands-on approach to teach students from around the country the Goldthread model of plant-based healthcare.

    2007

  • Goldthread continues to emerge in the community through a school apothecary program and the launch of their first herbal CSA.

    2008

  • Goldthread Essential Oil Distillery opens, providing groups the opportunity to visit & learn the process of distilling, like the Kirpalu School of Ayurveda. Essential oils are incorporated to the apothecary product line.

    2009

  • The desire to share the power of plants continues to grow, and Bill bottles up the magic which leads to the evolution of Goldthread Tonics.

    2015

  • The Goldthread crew heads to Bolivia on their first Plantventure, where they collaborate directly with those involved in herb cultivation and stewardship from around the world. They realize the importance of the involvement of these growers to the quality and mission of the tonics.

    2015

  • Goldthread Tonics gain traction and popularity with launch in Whole Foods New England, among other East Coast retailers.

    2016

  • Goldthread moves to SoCal to root into the plant-centric lifestyle. Goldthread HQ opens in Santa Monica with brand activation tonic bar and gardens.

    2017

  • Goldthread pop's up at events all over Los Angeles & hosts fun Plantventure Experiences with our friends at goop, Wanderlust Wellspring, MindBodyGreen, Sakara Life & Chill House.

    2018

  • Goldthread goes nationwide, confirming distribution with Target, Whole Foods, and Sprouts.

    2019

  • With tonics in high demand, Goldthread factory opens in Springfield, ΜΑ.

    2020

Tastes as Good as It Feels.

Each tonic is a careful balance of vibrant herbs, citrus, and natural sweetness — layered, refreshing, and deeply functional. It’s not about masking plant flavors, but showcasing them in a way that’s bold, clean, and genuinely enjoyable to drink.

Formulated to work. Crafted to crave.

Shop Tonics

The Plant Medicine Protocol

by William Siff

Looking to bring plant-powered wellness more deeply into your life? Rooted in decades of clinical experience and global herbal tradition, this book is packed with accessible protocols, daily rituals, and vibrant recipes that help you use herbs not just as remedies — but as a way of life.

Learn More