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Sunscreen issues. Not exactly the cover. Sunscreen is not real.⁉️

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... Read moreหลายคนเจอประสบการณ์เหมือนกันคือ ซื้อกันแดดตาม SPF/PA ที่เคลมไว้ แต่ใช้จริงแล้วแสบ ผิวหมอง หรือแดดทำร้ายจนรู้สึกว่า “กันแดดไม่ตรงปก” เลยค่ะ ช่วงนี้ที่ถูกพูดถึงมากคือมาตรฐานใหม่อย่าง ISO 23675 ซึ่งเกี่ยวกับการ “ทดสอบค่ากันแดด” แบบ in vitro (ทดสอบใน LAB) ทำให้หลายคนเริ่มถามว่า ISO 23675 คืออะไร แล้วกันแดดตัวไหนผ่านบ้าง? ISO 23675 (in vitro) คือมาตรฐานการทดสอบประสิทธิภาพการกันแดดด้วยวิธีในห้องแล็บ โดยหลัก ๆ จะมีการ “ปาด/ทา” ผลิตภัณฑ์ลงบนแผ่นทดลองให้ได้ความหนาตามที่กำหนด แล้วใช้เครื่องมือวัดการดูดซับ/การส่งผ่านรังสีเพื่อคำนวณค่าออกมา จุดที่คนสนใจคือเวอร์ชันใหม่จะควบคุมขั้นตอนให้ละเอียดขึ้น ทำให้ผลมีโอกาสคลาดเคลื่อนน้อยลง และหลายที่มีการใช้ระบบอัตโนมัติหรือหุ่นยนต์ช่วยปาดบนแผ่นทดลองเพื่อให้สม่ำเสมอกว่าเดิม (อันนี้เป็นเหตุผลที่หลายคนบอกว่า “ผ่านยากขึ้นมาก”). แล้วต่างจาก ISO 24444 คืออะไร? อธิบายแบบเข้าใจง่าย: ISO 24444 เป็นมาตรฐานทดสอบค่า SPF แบบ in vivo (ทดสอบบนผิวคน) ซึ่งเป็นอีกวิธีที่ใช้กันมานาน ส่วน ISO 23675 จะเป็นฝั่ง in vitro ที่ทำในแล็บ ทั้งสองอย่างพูดถึง “ประสิทธิภาพกันแดด” เหมือนกัน แต่เป็นคนละวิธีทดสอบและมีรายละเอียดเงื่อนไขต่างกัน ดังนั้นเวลาเห็นฉลาก/ผลทดสอบ ควรดูให้ชัดว่าอ้างอิงมาตรฐานไหน และทดสอบโดยแล็บไหน คำถามยอดฮิตคือ “รายชื่อกันแดดที่ผ่าน ISO 23675” หรือ “กันแดด ISO 23675 ตัวไหนผ่านบ้าง” ตรงนี้แนะนำให้เช็กจากเอกสารของแบรนด์โดยตรง เช่น รายงานผลทดสอบ/Certificate จากห้องแล็บ (มักมีชื่อมาตรฐาน ISO 23675 ระบุชัด) และดูวันที่ทดสอบด้วย เพราะมาตรฐานมีการอัปเดตได้ ไม่ใช่แค่เห็นคำว่า ISO แล้วเชื่อทันที ทิปส่วนตัวเวลาเลือกกันแดดให้ไม่พลาด: 1) เลือกแบรนด์ที่มีผลทดสอบอ้างอิงชัดเจน (ยิ่งมีทั้ง in vivo/in vitro ยิ่งดี) 2) ใช้ปริมาณให้พอ—ทาไม่ถึง ต่อให้ SPF สูงก็เอาไม่อยู่ 3) ทาซ้ำ โดยเฉพาะวันเจอแดดจัด/เหงื่อออก/เล่นน้ำ 4) ถ้าผิวแสบง่าย ให้เลือกสูตรที่อ่อนโยนและทดสอบกับผิวตัวเองก่อน สรุปคือ ISO 23675 ไม่ได้แปลว่า “กันแดดดีที่สุด” แต่ช่วยเพิ่มความน่าเชื่อถือของการเคลมค่าได้มากขึ้น ใครกำลังลังเลเพราะดราม่ากันแดดไม่ตรงปก ลองใช้มาตรฐานนี้เป็นหนึ่งในเกณฑ์เช็กก่อนตัดสินใจซื้อได้เลยค่ะ

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