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Can Sulfate-Free Foaming Base be used as a base for facial wash gel or foam? What is the recommended usage percentage?

Cosmetics Sulfate-Free Formulation Facial Cleanser Foaming Usage Percentage Viscosity
Posted by tor1903
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What percentage of Repair Activator™ Liquid is equivalent to using 1% of Repair Activator™ Powder?

Cosmetics Powder Liquid Additive Concentration Ingredient Comparison
Posted by misix24
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Based on the following formulation: Distilled Water 81%, Magnesium Ascorbyl Phosphate 10%, DMI 3%, Glyceryl glucoside 2%, Butylene Glycol 1.5%, Dipotassium Glycyrrhizate 1%, Xanthan Gum 1%, Phenoxyethanol 0.5 %. Can these ingredients be mixed together without using a blender? What is the correct order for mixing these ingredients? Thank you.

Cosmetics Mixing Procedure Equipment Issue Texture Serum Dispersion
Posted by nnlgecsfm
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I would like to use [url=https://www.myskinrecipes.com/shop/%E0%B8%A2%E0%B8%81%E0%B8%81%E0%B8%A3%E0%B8%B0%E0%B8%8A%E0%B8%B1%E0%B8%9A%E0%B8%9C%E0%B8%B4%E0%B8%A7/7931-phytotenser-skin-tenser.html:1611f00g]FlashTenser™ (Quick Skin Tenser)[/url:1611f00g] in a watery formulation such as a toner or pre-serum. What percentage should I use? When [url=https://www.myskinrecipes.com/shop/%E0%B8%A2%E0%B8%81%E0%B8%A3%E0%B8%B0%E0%B8%8A%E0%B8%B1%E0%B8%9A%E0%B8%9C%E0%B8%B4%E0%B8%A7/7931-phytotenser-skin-tenser.html:1611f00g]FlashTenser™ (Quick Skin Tenser)[/url:1611f00g] is added to a formulation for actual use, will it result in a sticky feeling (like [url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B9%88%E0%B8%AD%E0%B8%95%E0%B9%89%E0%B8%B2%E0%B8%99%E0%B8%A3%E0%B8%B4%E0%B9%89%E0%B8%A7%E0%B8%A2/637-dmae-dimethylaminoethanol-%E0%B8%A5%E0%B8%94%E0%B8%A3%E0%B8%B9%E0%B9%89%E0%B8%A2%E0%B8%A2-%E0%B8%95%E0%B9%88%E0%B8%AD%E0%B8%95%E0%B9%89%E0%B8%B2%E0%B8%99%E0%B8%AD%E0%B8%99%E0%B8%B8%E0%B8%A1%E0%B8%B9%E0%B8%A5%E0%B8%AD%E0%B8%B4%E0%B8%AA%E0%B8%A3%E0%B8%B0.html:1611f00g]DMAE[/url:1611f00g]) or an uncomfortable tight feeling (like [url=http://www.myskinrecipes.com/shop/%E0%B8%A2%E0%B8%81%E0%B8%81%E0%B8%B0%E0%B8%8A%E0%B8%B1%E0%B8%9A%E0%B8%9C%E0%B8%B4%E0%B8%A7/406-lift-now-pullulan.html:1611f00g]lift now[/url:1611f00g])? Thank you in advance.

Cosmetics Toner Serum Skin Tightening Stickiness Usage Percentage
Posted by thelittledraco
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I have the following formula: Alumina 3 SelectSorb™ (PMMA Oil Absorber) 5 QuikBlur™ (Polymethylsilsesquioxane Solution) 4 Polyethylene Wax (Soft) 2 Water-in-Oil EZ™ 3 LipidSoft™ Disperse 5 Allantoin 0.5 Calcium Pantothenate 2.00 Poly-Protect (Hydrolyzed Sclerotium Gum) 1 Mild Preserved Eco™ (Preservative-Free) 1 SPF Protect Ultra II 10 Zinc Oxide 35nm Liquid 5 PMMA Booster (SPF/Color Booster) 5 Can I make a sunscreen with this formula? Also, regarding Water-in-Oil EZ™, is it true that I can use any amount of water in the formula?

Cosmetics Sunscreen Formulation Water-in-Oil Stability Emulsifier Ingredient Ratio
Posted by wissanu_com
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I am planning to make a serum and have the following questions: 1. Regarding the penetration enhancer, Phospholipid (Hydrogenated Lecithin): Based on what I've read, does the formula need to contain both water and oil? 2. If I have MySkinRecipes mix the ingredients for me, do I need to add Disodium EDTA? (The water that the system adds to complete 100% is water that does not require adding Disodium EDTA into the formula, correct?) 3. Is the following formula feasible? I would like a slightly viscous texture that doesn't flow like water (it's acceptable if it takes some time to absorb, but not too long). **Ingredients:** * Pal-GHK, Pal-GQPR (eq. Matrixyl 3000) 3% * Acetyl Hexapeptide-8 (eq. Argireline) 10% * Energy-Blend™ (Caffeine+Adenosine+Vitamin B3) 5% * Calcium Pantothenate 3% * DMAE (SkinTight MD™) Liquid 3% * Mild Preserved Eco™ (Preservative-Free) 2% * Phospholipid 2% * Argan Oil (Organic - Virgin - Deodorized) 5% * Distilled Water (Sterile) 67% 4. Does this initial formula have any odor? 5. What kind of packaging will MySkinRecipes use for this formula if they mix it for me? Are there example pictures available? 6. After payment, how long does it take to receive the order? (This is for a test batch). Thank you.

Cosmetics Serum Anti-aging Skin Tightening Viscosity Odor
Posted by whalelanding
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Based on the following formula, are there any issues or problems that need to be addressed before proceeding with production? [url=https://www.myskinrecipes.com/shop/%E0%B8%A5%E0%B8%94%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%A3%E0%B8%B0%E0%B8%84%E0%B8%B2%E0%B8%A2%E0%B9%80%E0%B8%84%E0%B8%B7%E0%B8%AD%E0%B8%87/7564-skin-mimic-skin-barrier-restoration.html:dwxt5fnq]Skin-mimic™ (Skin Barrier Restoration)[/url:dwxt5fnq] 10.00 % [url=https://www.myskinrecipes.com/shop/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%8A%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%8A%E0%B8%B7%E0%B9%89%E0%B8%99%E0%B8%9C%E0%B8%B4%E0%B8%A7-moisturizer/1281-skinlipid-second-skin.html:dwxt5fnq]SkinLipid™[/url:dwxt5fnq] 5.00 % [url=http://www.myskinrecipes.com/shop/emollient-ester-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%99%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99/1203-ethyl-linoleate.html:dwxt5fnq]LipidSoft™ F (Ethyl Linoleate)[/url:dwxt5fnq] 2.00 % [url=http://www.myskinrecipes.com/shop/%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2%E0%B8%AA%E0%B8%B4%E0%B8%A7%E0%B8%AD%E0%B8%B8%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B8%99/841-capryloyl-salicylic-acid-lha-powder.html:dwxt5fnq]Capryloyl Salicylic Acid (LHA)[/url:dwxt5fnq] Powder 0.50 % [url=https://www.myskinrecipes.com/shop/%E0%B8%95%E0%B9%89%E0%B8%B2%E0%B8%99%E0%B8%AD%E0%B8%99%E0%B8%B8%E0%B8%A1%E0%B8%B9%E0%B8%A5%E0%B8%AD%E0%B8%B4%E0%B8%AA%E0%B8%A3%E0%B8%B0/7541-quercetin-98-purity-powder.html:dwxt5fnq]Idebenone[/url:dwxt5fnq] 0.50 % [url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B9%88%E0%B8%AD%E0%B8%95%E0%B9%89%E0%B8%B2%E0%B8%99%E0%B8%A3%E0%B8%B4%E0%B9%89%E0%B8%A7%E0%B8%A3%E0%B8%AD%E0%B8%A2/1022-scutellaria-baicalensis-root-extract.html:dwxt5fnq]Pure-Baicalin[/url:dwxt5fnq]™ 0.30 % [url=http://www.myskinrecipes.com/shop/%E0%B8%A1%E0%B8%AD%E0%B8%A2%E0%B8%8B%E0%B9%8C%E0%B9%80%E0%B8%88%E0%B8%AD%E0%B8%A3%E0%B9%8C/770-rhamnose-%E0%B9%81%E0%B8%A3%E0%B9%82%E0%B8%99%E0%B8%AA.html:dwxt5fnq]Rhamnose[/url:dwxt5fnq] ([url=http://www.myskinrecipes.com/shop/%E0%B8%A1%E0%B8%AD%E0%B8%A2%E0%B8%8B%E0%B9%8C%E0%B9%80%E0%B8%88%E0%B8%AD%E0%B8%A3%E0%B9%8C/770-rhamnose-%E0%B9%81%E0%B8%A3%E0%B9%82%E0%B8%99%E0%B8%AA.html:dwxt5fnq]น้ำตาลแรมโนส[/url:dwxt5fnq]) 5.00 % [url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B9%88%E0%B8%AD%E0%B8%95%E0%B9%89%E0%B8%B2%E0%B8%99%E0%B8%A3%E0%B8%B4%E0%B9%89%E0%B8%A7%E0%B8%A3%E0%B8%AD%E0%B8%A2/6613-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%AA%E0%B8%81%E0%B8%B1%E0%B8%94%E0%B8%88%E0%B8%B2%E0%B8%81%E0%B9%84%E0%B8%82%E0%B9%88%E0%B8%9B%E0%B8%A5%E0%B8%B2%E0%B9%81%E0%B8%Aซ%E0%B8%A5%E0%B8%A1%E0%B8%AD%E0%B8%99-salmon-roe-extract.html:dwxt5fnq]Salmon Roe Extract[/url:dwxt5fnq] 1.00 % [url=https://www.myskinrecipes.com/shop/anti-wrinkle/7082-ultrasomes-micrococcus-lysate.html:dwxt5fnq]Ultrasomes Micrococcus Lysate[/url:dwxt5fnq] 1.00 % [url=https://www.myskinrecipes.com/shop/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%8A%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%8A%E0%B8%B7%E0%B9%89%E0%B8%99%E0%B8%9C%E0%B8%B4%E0%B8%A7-moisturizer/7765-ppg-24-glycereth-24.html:dwxt5fnq]TransMoist™ (PPG-24-Glycereth-24)[/url:dwxt5fnq] 2.00 % [url=http://www.myskinrecipes.com/shop/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%8A%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%8A%E0%B8%B7%E0%B9%89%E0%B8%99%E0%B8%9C%E0%B8%B4%E0%B8%A7-moisturizer/7358-peg-ppg-14-7-dimethyl-ether.html:dwxt5fnq]VersaMoist™ (PEG/​PPG-14/​7 Dimethyl Ether)[/url:dwxt5fnq] 2.00 % [url=http://www.myskinrecipes.com/shop/penetration-enhancer-%E0%B8%99%E0%B8%B3%E0%B8%9E%E0%B8%B2%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%AA%E0%B8%B9%E0%B9%88%E0%B8%9C%E0%B8%B4%E0%B8%A7/5987-dimethyl-isosorbide-isosorbide-dimethyl-ether.html:dwxt5fnq]Dimethyl Isosorbide (DMI)[/url:dwxt5fnq] 3.00 % [url=http://www.myskinrecipes.com/shop/additive-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%95%E0%B8%B4%E0%B8%A1%E0%B9%81%E0%B8%95%E0%B9%88%E0%B8%87/2071-odor-kill-%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2%E0%B8%99%E0%B9%89%E0%B8%B3.html:dwxt5fnq]Odor-Kill™[/url:dwxt5fnq] (ละลายน้ำ) 1.00 % [url=http://www.myskinrecipes.com/shop/%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%81%E0%B8%B1%E0%B8%99%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B8%A2/1001-ethylhexylglycerin-caprylyl-glycol.html:dwxt5fnq]Mild Preserved Eco™[/url:dwxt5fnq] ([url=http://www.myskinrecipes.com/shop/%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%81%E0%B8%B1%E0%B8%99%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B8%A2%E0%B9%80%E0%B8%84%E0%B8%A1%E0%B8%B5/1001-ethylhexylglycerin-caprylyl-glycol.html:dwxt5fnq]Preservative-Free[/url:dwxt5fnq]) 1.00 % [url=https://www.myskinrecipes.com/shop/oil-in-water-emulsifier/8007-cetearyl-glucoside-and-cetearyl-alcohol.html:dwxt5fnq]Moist Cream Maker™[/url:dwxt5fnq] 3.00 % [url=http://www.myskinrecipes.com/shop/55-emollient-ester-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%99%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99:dwxt5fnq]LipidSoft™[/url:dwxt5fnq] Cyclo 5.00 % [url=http://www.myskinrecipes.com/shop/%E0%B8%AA%E0%B9%88%E0%B8%A7%E0%B8%99%E0%B8%9B%E0%B8%A3%E0%B8%B0%E0%B8%81%E0%B8%AD%E0%B8%9A%E0%B9%80%E0%B8%84%E0%B8%A3%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%87%E0%B8%AA%E0%B8%B3%E0%B8%AD%E0%B8%B2%E0%B8%87%E0%B8%84%E0%B9%8C/153-citric-acid-%E0%B8%81%E0%B8%A3%E0%B8%94%E0%B8%8B%E0%B8%B4%E0%B8%95%E0%B8%A3%E0%B8%B4%E0%B8%81-%E0%B8%81%E0%B8%A3%E0%B8%94%E0%B8%A1%E0%B8%B0%E0%B8%99%E0%B8%B2%E0%B8%A7.html:dwxt5fnq]Citric Acid[/url:dwxt5fnq] (High Purity, Anhydrous) 0.20 % [url=http://www.myskinrecipes.com/shop/%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%97%E0%B8%B3%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2/838-%E0%B8%99%E0%B9%89%E0%B8%B3%E0%B8%81%E0%B8%A5%E0%B8%B1%E0%B9%88%E0%B8%99%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%AA%E0%B8%B8%E0%B8%97%E0%B8%98%E0%B8%B4%E0%B9%8C.html:dwxt5fnq]น้ำกลั่น[/url:dwxt5fnq] ปราศจากเชื้อ 57.50 % Thank you.

Cosmetics Formula Review Cream Stability pH Adjustment Mixing Procedure
Posted by misix24
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Could you please review the ingredients for a hair mask? I would like to order the raw materials to make it myself at home. The ingredients are: mineral oil, Dimethicone, Almond Oil, Argan Oil, Cetearyl Alcohol, Cetyl Alcohol, Behentrimonium Chloride, Cetrimonium Chloride, Aqua, EDTA, Glycerine, HydroxyethylCellulose, Cyclopentasiloxane, Polymethylsilsesquioxane, Panthenol, DMDM Hydantoin, Amodimethicone, Hydrolyzed Keratin. Thank you in advance.

Cosmetics Hair Treatment Damaged Hair Care Raw Material Formula Review Texture
Posted by p.meemak
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I would like to ask about the formula for 3% Linked Papain. If this is used as a daily cream, will it cause excessive exfoliation? Or is it more suitable to use it as a wash-off mask instead?

Cosmetics Cream Exfoliation Skin Irritation Sensitive Skin Wash-off Application
Posted by kawaki_tilek
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I would like to ask if it is possible to use both molecular weights of PolyGlutamic Acid (High Molecule Weight and the other one) together in a formulation. If so, what percentage should I use for each, or what is the total percentage recommended?

Cosmetics Molecular Size Hydration Usage Percentage Serum Skin Absorption
Posted by oatarts
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I would like to create a light essence formula to reduce shallow melasma, dark spots, and acne marks. I have drafted the following formula with percentages: 1. Chamomile Water (Anthemis Nobilis) 69.40% 2. Safe-B3™ (Vitamin B3, Niacinamide) 5.00% 3. Hydro-White™ 1.50% 4. 4MSK 3.00% 5. Tranexamic Acid 3.00% 6. 4D Hyaluronic Acid 5.00% 7. French Pine Bark Extract 25 (Liquid) 2.50% 8. Centella Asiatica Extract (Madecassoside) 0.50% 9. GlucoBright™ (Acetyl glucosamine) 5.00% 10. Japanese Cedar 1.00% 11. PiteraEx™ 1.50% 12. Ethoxydiglycol 2.60% My questions are: 1. Are the ingredients compatible? 2. Safe-B3 has a pH of 6-7.5. Will this affect the formula? 3. Can I mix ingredients 1-12 in order?

Cosmetics Essence Skin Brightening Compatibility Stability Mixing Procedure
Posted by aoonjung
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I purchased 10% Niacinamide from another brand, but it doesn't come with a penetration enhancer. I plan to buy Ethoxydiglycol separately to use. Can I mix it into Aloe Vera Gel Lite? If so, can I also add other active ingredients myself? I want benefits for brightening, anti-wrinkle, and anti-irritation. The ingredients and percentages I plan to use are: 1. Licorice Extract (Glabridin 4.5%, Water-Soluble) 2% 2. Ume Extract (Anti-Glycation) 2% 3. Ectoine (from Bio-fermentation) 2% 4. Pal-GHK, Pal-GQPR (eq. Matrixyl 3000) 3% 5. Copper Peptide (GHK-Cu) (1000ppm Solution) 2% 6. Ethoxydiglycol 2% 7. Aloe Vera Gel Lite 87% Could the R&D team please check if this gel formulation is feasible or if any adjustments are needed? Also, can it be mixed manually? Thank you.

Cosmetics Gel Mixing Procedure Penetration Enhancer Solubility Compatibility
Posted by oatarts
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I want a clear gelling agent for an oil base, such as Bhimsen camphor water. Which one should I use?

Cosmetics Gel Oil Gel Clarity Oil Gellant Oil-based Formulation
Posted by amekorns
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I have a Sleeping Mask formula focused on exfoliation and hydration. I want the product texture to be a moist coating, like a mask, but not too heavy. Can this formula be used? Is anything missing, or are there any incompatible ingredients? Here is the formula with percentages: 1. Rose Water (Rosa Damascena) 54.5% 2. Prebio-care (Skin Prebiotic) 3% 3. Urea 5% 4. MOIST24 5% 5. Ectoine (Ectoin, from Bio-fermentation) 1% 6. Triacetin (Glycerol triacetate) 1% 7. Sodium PCA 50% 5% 8. Sodium Lactate (60% Liquid) 5% 9. Natural PHA (Gluconolactone) 10% 10. Pumpkin Renew™ (Gentle Exfoliation) 5% 11. Yeast Resurface 3% 12. Palmitamide MEA 1% 13. Silk Cream Maker™ 1.5% Thank you in advance.

Cosmetics Sleeping Mask Exfoliation Hydration Formula Review Preservation
Posted by thnptbu
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If a product uses the following ingredients in the specified amounts, can it still be claimed as 100% natural? [url=http://www.myskinrecipes.com/shop/%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%81%E0%B8%B1%E0%B8%99%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B8%A2/155-phenoxyethanol-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%81%E0%B8%B1%E0%B8%99%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B8%A2-%E0%B9%84%E0%B8%A1%E0%B9%88%E0%B8%A1%E0%B8%B5paraben.html:2uzkll8c]Phenoxyethanol[/url:2uzkll8c] [url=http://www.myskinrecipes.com/shop/%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%81%E0%B8%B1%E0%B8%99%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B8%A2/928-optiphen-plus.html:2uzkll8c]Phenoxyethanol SA[/url:2uzkll8c] [url=http://www.myskinrecipes.com/shop/%E0%B9%81%E0%B9%81%E0%B8%A7%E0%B9%87%E0%B8%81%E0%B8%8B%E0%B9%8C-wax/1482-hydrogenated-castor-oil.html:2uzkll8c]Hydrogenated Castor Oil[/url:2uzkll8c] [url=http://www.myskinrecipes.com/shop/emulsifier/175-polysorbate-20-tween-20.html:2uzkll8c]Polysorbate20[/url:2uzkll8c], Benzalkonium Chloride [url=http://www.myskinrecipes.com/shop/make-up-remover/971-oilsify-15-cleansing-oil-emulsifier.html:2uzkll8c]Oilsify[/url:2uzkll8c]30 [url=http://www.myskinrecipes.com/shop/emollient-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%99%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99/655-mineral-oil-paraffinum-liquidum.html:2uzkll8c]Mineral Oil ชนิดหนัก[/url:2uzkll8c] [url=http://www.myskinrecipes.com/shop/55-emollient-ester-%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%99%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99:2uzkll8c]LipidSoft[/url:2uzkll8c] Plam

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I made a gel formulation with Chamomile Water 94%, Xanthan Gum 1%, and Glycerine 5%. After 10 days, a thin white film appeared in the gel. What could be the cause of this?

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What are the possible uses of Flower Water (Floral Water), such as the Rose Water product mentioned here? Can it be mixed into creams or lotions? Can it be used in food or desserts? What other applications are there? Please provide guidance.

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Can Dipropylene glycol be dissolved in oil for making reed diffusers?

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Based on the information stating that Azelaic Acid (Liquid Azelaic™) and Zinc PCA cannot be used together, does this mean they cannot be included in the same formulation? If they are in separate formulations, can they be applied to the skin at the same time?

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