Hello! I understand your questions regarding the soap, shampoo, and conditioner formulations for adults and children, including adding fragrance and clarifying the effectiveness of certain hair care ingredients. I will explain point by point.

Recommendations on Formulas and Ingredients

1. Use of Preservatives in Soap, Shampoo, and Conditioner

Products like cleansers and conditioners that contain water require preservatives to prevent microbial growth, which can cause product degradation and be unsafe for use. Recommended preservatives include Phenoxyethanol SA or Mild Preserved Eco at appropriate concentrations according to their usage guidelines (typically around 1%).

2. Separate Adult Conditioner Formula (with Anti-Dandruff Properties)

The conditioner formula you inquired about, using BTAC and CTAC as primary conditioning agents and adding Dandruff-Guard™ for anti-dandruff properties, is correct and can be used.

Example Hair Conditioner Formula with BTAC and CTAC (with Dandruff-Guard™)

1. Water 92.5%
2. Cetyl Alcohol 2%
3. BTAC 1.5%
4. CTAC 1%
5. Propylene Glycol 1%
6. Pure Keratin 1%
7. Phenoxyethanol SA 1%
8. Dandruff-Guard™ 0.5%

Mixing Procedure:

1. Combine ingredients 2, 3, 4, and 5 and heat to approximately 70°C until the solid ingredients dissolve.
2. Add the mixture from step 1 to the water (ingredient 1) and stir or blend well.
3. Allow the mixture to cool down to no more than 40°C.
4. Add ingredients 6 (Pure Keratin), 7 (Phenoxyethanol SA), and 8 (Dandruff-Guard™). Stir or blend gently to disperse them evenly.

• Note: You can adjust the amount of Cetyl Alcohol to increase/decrease the thickness of the cream and adjust the amount of BTAC to increase/decrease the hair coating (conditioning) effectiveness.*

3. & 4. Effectiveness of Hair Nourishing Ingredients (e.g., Jojoba Oil, Hydro Protein) in Rinse-Off Products

As the team previously advised, cleansing products (soap, shampoo) are rinsed off quickly. This means that most skin or hair nourishing ingredients that do not have a positive charge and cannot adhere well to the hair will be washed away rapidly, resulting in limited conditioning benefits.

• Jojoba Oil and Hydro Protein (Soy, Oat, Wheat, Maize Protein), as well as Natural Moisturizing Amino Acids, Creatine 100, Sea Kelp Extract, Pure Keratin, and Panthenol, are good nourishing ingredients. However, they provide maximum effectiveness when used in Leave-on products (applied and not rinsed off) or in Treatment/Mask products where they are left on the hair for a longer time, allowing the ingredients more time to penetrate and adhere to the hair.
• For addressing dry, frizzy hair and adding weight, Hair Conditioning Agents with a positive charge, such as BTAC, CTAC, SiliWater, or Hair Wheat Protein, are more effective at coating the hair even in rinse-off products. This is because their positive charge helps them adhere to the negatively charged hair, making hair soft, smooth, less tangled, less frizzy, and adding weight.

Therefore, using Jojoba Oil or Hydro Protein in rinse-off shampoo or conditioner may provide some smoothness, but it will not be as effective as using cationic Hair Conditioning Agents or using these nourishing ingredients in Leave-on products.

5. Adding Fragrance (Mandarin Freshy or Citrus Scent)

You can add fragrance to the formulas. For fragrances like Mandarin Freshy or other Citrus scents, which are Fragrance Oils, they should be added in the final step of mixing, after the main ingredients are well combined and have cooled down (the temperature should not exceed 40°C) to prevent the fragrance from evaporating or degrading from heat.

Steps for Adding Fragrance:

1. Complete all other mixing steps according to the formula until the product is finished and has cooled down (approximately 30-40°C).
2. Slowly add the Mandarin Freshy fragrance oil in the desired concentration (typically for rinse-off products like shampoo, soap, conditioner, fragrance is used at about 0.1 - 1%, depending on the fragrance's intensity and personal preference).
3. Stir or blend the mixture gently until the fragrance is evenly distributed. Be careful not to stir too vigorously, as this can create excessive foam.

Adding fragrance will add a pleasant scent to the product, making it enjoyable to use.

I hope this explanation is helpful. If you have any further questions, please feel free to ask.