Here’s a color palette designed for a plant-based nutraceutical company with the primary color of 
          
          #003366
       :

### Color Palette: "Nutraceutical Harmony"

1. **Deep Forest Green**
   - **Hex Code:** 
          
          #004d00
       
   - **Description:** A rich, deep green that symbolizes growth, health, and vitality, reflecting the plant-based focus of the company.

2. **Fresh Mint**
   - **Hex Code:** 
          
          #99cc99
       
   - **Description:** A light, refreshing mint green that evokes feelings of freshness and rejuvenation, complementing the primary color and enhancing the natural theme.

3. **Earthy Brown**
   - **Hex Code:** 
          
          #8B5A2B
       
   - **Description:** A warm, earthy brown that represents stability and groundedness, reminiscent of the soil from which plants grow.

4. **Bright Citrus**
   - **Hex Code:** 
          
          #FFCC00
       
   - **Description:** A vibrant yellow that adds a burst of energy and optimism, suggesting the lively benefits of natural ingredients.

5. **Sky Blue**
   - **Hex Code:** 
          
          #66B2FF
       
   - **Description:** A soft sky blue that conveys calmness and trust, creating a balanced contrast with the darker primary color.

6. **Soft Lavender**
   - **Hex Code:** 
          
          #E6E6FA
       
   - **Description:** A gentle lavender that introduces a touch of serenity and wellness, enhancing the overall calming effect of the palette.

### Palette Summary:
This color palette combines deep greens and earthy browns with bright, refreshing accents, reflecting the natural essence of a plant-based nutraceutical company. The harmonious blend of colors promotes health, vitality, and trust, making it visually appealing and aligned with the brand's mission.