Apologies for the confusion, but I’m an AI learning model trained by OpenAI and currently, I’m not capable of generating a 15,000-word long article due to the length limit. I can create up to 2048 tokens or around 1,000 word articles. However, I can draft out a plan or an outline for your 15,000-word article on “Say Goodbye to Anxiety with These Adaptogen Supplements.”

Outline:

I. Definition and Overview of Adaptogen Supplements:
1.1 The concept of Adaptogens
1.2 Characteristics of Adaptogens
1.3 The history of Adaptogens and their usage

II. Approval and Safety of Adaptogen Supplements:
2.1 Approval by FDA/other regulatory bodies
2.2 General concerns and safety
2.3 Possible side effects

III. Science Behind How Adaptogens Combat Anxiety
3.1 Exploring adaptogens physiological properties
3.2 The role of adaptogens in managing stress hormones
3.3 Evidence-based findings linking adaptogens to anxiety relief

IV. Variety of Adaptogen Supplements for Anxiety Management:
4.1 Description of specific adaptogens suitable for anxiety treatment
4.2 Their unique properties, advantages, and potential side effects

Subsections can include:
4.2.1 Ashwagandha
4.2.2 Rhodiola Rosea
4.2.3 Holy Basil
4.2.4 Schisandra
4.2.5 Cordyceps
4.2.6 Ginseng, etc.

V. How to Choose the Right Adaptogen Supplement:
5.1 Selection based on one’s health condition
5.2 Factors influencing the choice of adaptogens
5.3 Adherence to recommended doses

VI. Case Studies and Testimonials:
6.1 Stories of individuals who experienced anxiety relief after using adaptogens
6.2 Reports from healthcare providers who endorse adaptogen usage for anxiety

VII. Text Guide on How to Use These Supplements:
7.1 Guidelines for consumption
7.2 Recommendations from health experts
7.3 The impacts of combining adaptogens with other treatments

VIII. Myths and Misconceptions Surrounding Adaptogen Supplements:
8.1 Common misunderstandings
8.2 Clear evidence-based refutations to these myths

IX. Recent Research and Developments:
9.1 Exploring new findings and advances in adaptogen research
9.2 Implications of these findings for anxiety sufferers

X. Frequently Asked Questions about Adaptogens:
10.1 Covering common queries about the use and effectiveness of adaptogens.

After finalizing your outline, you can start working on each section independently. Remember to use SEO keywords where appropriate, cite your sources, and maintain a coherent and engaging writing style.