虽说美白新品的发布大多集中在九、十月,但如果问我最佳的美白黄金期,必须是冬季。Why?天时+地利+人和!首先外部的刺激少了,冬季的紫外线强度全年最低,只有春夏季鼎盛时期的1/3;其次因为寒冷户外活动也相对减少,穿的最多露出的皮肤面积全年最少,皮肤接触紫外线的频率降低很多。经常听老人说,捂一个冬天就白回来了,看来是有点道理的。当然作为现代护肤人,光靠捂是完全不够的,各种美白产品加持才能白的更快、更亮、更有质感。你知道是什么让我们变黑变暗沉长斑点了吗?黑色素?NO!酪氨酸酶才是元凶。它是人体内一种具有双重催化功能的生物酶,参与调控人体内黑色素的合成过程,覆盖了黑色素形成的整条通路,是合成黑色素细胞的关键因素。体内的酪氨酸会和酪氨酸酶在氧化作用下转化为多巴醌,多巴醌在氧元素的作用下最终生成黑色素,且酪氨酸酶活性越强,黑色素形成越快、皮肤黑越快。 也就是能影响或阻断酪氨酸酶成了美白的关键。所以目前市面上主流的美白成分,大多数都是针对酪氨酸酶的,只是作用机制略有不同。优点:美白、抗氧、抗老功效都兼顾,基本各种肤质都可。缺点:原型VC起效快但不太稳定;VC衍生物稳定,但起效慢且光敏。优点:美白淡斑、比较温和稳定、无刺激,基本各种肤质都可。 缺点:光敏、有一定刺激性,需要建立耐受,限制添加量0.5%。缺点:容易氧化不稳定、有一定刺激性,限制添加量1%。今年SCCS欧盟新规里关于美白成分,限制了高浓度曲酸1%、a-熊果苷2%和熊果苷7%,各位小伙伴在选择时可以规避一下。除了成分,整体美白配方的完整性也很重要,因为大多数美白成分都有一定的刺激性,每个成分也有各自的优缺点,考验技术的时候到了。很多品牌都有自己的美白专利成分或专研配方,复配了不同的美白成分,协同作用于黑色素形成的不同时期,来达到不同层面的美白效果;同时还会复配各种舒缓修护、保湿抗氧的成分,来降低刺激性提高皮肤的耐受力,让肤感更温和,更容易坚持用下去。黑色素从形成到上升至角质层是需要时间的,所以我们在使用美白产品时,也要有耐心。虽然很多产品会说坚持使用28天会看到效果,但它的基础是皮肤角质代谢周期正常的情况下,现在大部分人的角质代谢周期都变慢了,所以美白产品的使用最好是在45-60天左右,再去观察评判它的效果如何。本身角质代谢比较慢的,如果美白产品中有复配剥落角质的成分最好,如果没有可以根据皮肤状况每周增加一次温和的酸类护理,低浓度比较温和的水杨酸、杏仁酸都是不错的选择,它能加速角质层的黑色素细胞代谢,整体均匀肤色、提亮的效果不错。冬季的基础护肤偏保湿滋润,对于美白来说是加持、双赢的搭配。如果你希望自己的肤色能更亮更透更匀,这个冬天悄悄做好美白护理,来年开春一定会有惊喜。如果皮肤本身处于炎症期、屏障损伤期,就不要强行美白了(效果不好且容易加重刺激不适感),等皮肤保湿修护到一个稳定的状态再用也不迟。 ","gnid":"9c1816ea3285f91c4","img_data":[{"flag":2,"img":[{"desc":"","height":80,"s_url":"https://p0.ssl.img.360kuai.com/t0182a98fd2cbd8f754_1.gif","title":"","url":"https://p0.ssl.img.360kuai.com/t017e760042c0a3454f.gif","width":900},{"desc":"","height":"889","title":"","url":"https://p0.ssl.img.360kuai.com/t015f1956dace66f6df.jpg","width":"650"},{"desc":"","height":"1104","title":"","url":"https://p0.ssl.img.360kuai.com/t0112f2805740f36606.jpg","width":"736"},{"desc":"","height":"1004","title":"","url":"https://p0.ssl.img.360kuai.com/t01b64d9a57bea66ad7.jpg","width":"669"},{"desc":"","height":"597","title":"","url":"https://p0.ssl.img.360kuai.com/t0159716aabe78f7d1c.jpg","width":"1080"},{"desc":"","height":"441","title":"","url":"https://p0.ssl.img.360kuai.com/t01ed380da4c974835c.jpg","width":"972"},{"desc":"","height":"640","title":"","url":"https://p0.ssl.img.360kuai.com/t018946c8e91e8ef24f.jpg","width":"421"},{"desc":"","height":"843","title":"","url":"https://p0.ssl.img.360kuai.com/t010b8cf0a5024918a9.jpg","width":"562"},{"desc":"","height":"441","title":"","url":"https://p0.ssl.img.360kuai.com/t01838af3a9ff5cef1b.jpg","width":"972"},{"desc":"","height":"705","title":"","url":"https://p0.ssl.img.360kuai.com/t0111bd53c9d71ca154.jpg","width":"470"},{"desc":"","height":"1104","title":"","url":"https://p0.ssl.img.360kuai.com/t0138caf5fa0606e602.jpg","width":"736"},{"desc":"","height":"999","title":"","url":"https://p0.ssl.img.360kuai.com/t018ba45ed7d40b9676.jpg","width":"666"},{"desc":"","height":"1000","title":"","url":"https://p0.ssl.img.360kuai.com/t01a796bb7e5b88bbdd.jpg","width":"667"},{"desc":"","height":"1102","title":"","url":"https://p0.ssl.img.360kuai.com/t01a2289f222b516989.jpg","width":"736"},{"desc":"","height":"821","title":"","url":"https://p0.ssl.img.360kuai.com/t0141e47e4877fe73db.jpg","width":"615"},{"desc":"","height":"920","title":"","url":"https://p0.ssl.img.360kuai.com/t01710260df7ea1cf22.jpg","width":"736"},{"desc":"","height":"441","title":"","url":"https://p0.ssl.img.360kuai.com/t01503493eaac121928.jpg","width":"972"},{"desc":"","height":"509","title":"","url":"https://p0.ssl.img.360kuai.com/t01e2cbcf471dd75bc9.jpg","width":"509"},{"desc":"","height":"441","title":"","url":"https://p0.ssl.img.360kuai.com/t01fc81e180dd6e7b1e.jpg","width":"972"},{"desc":"","height":"736","title":"","url":"https://p0.ssl.img.360kuai.com/t010b0406bb28cbba51.jpg","width":"736"},{"desc":"","height":"2798","title":"","url":"https://p0.ssl.img.360kuai.com/t01ecd6194d5d92b90e.jpg","width":"1080"},{"desc":"","height":"356","s_url":"https://p0.ssl.img.360kuai.com/t0187128681cd492dfd_1.gif","title":"","url":"https://p0.ssl.img.360kuai.com/t0187128681cd492dfd.gif","width":"640"},{"desc":"","height":"198","s_url":"https://p0.ssl.img.360kuai.com/t01702584d14622ac93_1.gif","title":"","url":"https://p0.ssl.img.360kuai.com/t01702584d14622ac93.gif","width":"620"},{"desc":"","height":"300","s_url":"https://p0.ssl.img.360kuai.com/t0128ff5211e435e102_1.gif","title":"","url":"https://p0.ssl.img.360kuai.com/t0128ff5211e435e102.gif","width":"620"}]}],"original":0,"pat":"art_src_3,fts0,sts0","powerby":"pika","pub_time":1701693900000,"pure":"","rawurl":"http://zm.news.so.com/ffaaed8af4f859741d4b9e9906c2730e","redirect":0,"rptid":"75cc547c86018806","rss_ext":[],"s":"t","src":"时尚COSMO","tag":[{"clk":"khealth_1:黑色素细胞","k":"黑色素细胞","u":""},{"clk":"khealth_1:黄金","k":"黄金","u":""}],"title":"这个黄金美白期,错过要再等一年!
冷义视4644为什么左旋多巴要与甲基多巴肼合用?
阮谈软19776978030 ______ 30年前,左旋多巴作为一种神奇新药被介绍用于治疗帕金森氏 病.尽管其药理作用复杂,但至今仍是治疗本病的最佳药物,它有着 最优的治疗边缘(与治疗作用相比,其...
冷义视4644...世界著名拳王阿里现在就正处于这种病症的折磨之下.而目前已研究出一种新型药物可用于这种病症的治疗,称为L - 多巴.L - 多巴也是一种有机物,结构简... -
阮谈软19776978030 ______[选项] A. L-多巴是一种二肽化合物 B. L-多巴是一种氨基酸 C. L-多巴既有酸性又有碱性 D. L-多巴仅具酸性
冷义视4644...6 H 6 O 4 ,结构简式为 ,其所含有的官能团有(写结构简式)_____________________________________________________________. (2)L - 多巴用... -
阮谈软19776978030 ______[答案] 解析 (1) (2) 答案 (1)—OH、 (2)酚羟基、氨基、羧基
冷义视4644根据甲基多巴的化学结构,有哪些重要的性质?配制和贮存它的制剂应注意什么 -
阮谈软19776978030 ______ 甲基多巴(methyldopa),别名:甲多巴,阿道美,爱道美;分子式:C10H13NO4,分子量:211.214 ,密度:1.354g/cm3 ,熔点:300℃ ,沸点:436.3°C at 760 mmHg ,闪点:217.7°C ,蒸汽压:2.19E-08mmHg at 25°C 1.分子结构: ...
冷义视4644L - 多巴是治疗帕金森氏症的药物.关于L - 多巴的说法中,不正确的是( ) -
阮谈软19776978030 ______[选项] A. 其分子式为C9H11O4N B. 核磁共振氢谱上共有8个峰 C. 能与酸、碱反应生成盐 D. 能与浓溴水发生取代反应
冷义视4644白癜风发病的诱因主要是从哪些方面来讲呢? -
阮谈软19776978030 ______ 白癜风的常见的8大诱因: 1、神经功能障碍:多发于周围神经,节段神经起着关键作用,多是由于精神和物质引起的神经功能失调发生的神经功能障碍.特点:多发于受障碍周围神经的所属区域. 2、遗传:患者有直系遗传与隔辈遗传,上三...
冷义视4644黑色素和黑素一样吗 -
阮谈软19776978030 ______ 是一样的. 黑素 位于表皮基底细胞层的黑素细胞所产生,分布于表皮的基底细胞及棘细胞内.黑素为机体内的生物滤光器,能吸收大部分有害的紫外线,保护和减轻由于日光引起的急性和慢性皮肤损伤.皮肤颜色是由黑素决定的.黑素为一脂...
冷义视4644A.长期暴露在空气中易变质 B.既有酸性,又有碱性 -
阮谈软19776978030 ______ D为本题答案.A,酚,被氧化B,就是不考虑酚,也是氨基酸.C,氨基酸能聚合,也能做酚醛树脂.
冷义视4644为什么看见最喜欢的人和其他异性打闹,心会痛?不要说吃醋爱什么的,请根据人的生理结构回答,专业! -
阮谈软19776978030 ______ 应该和分泌的5-羟色胺,多巴胺,肾上腺素有关 .当你面对使你不愉快的因为感情的问题时,中枢释放神经递质,可以影响你的精神情绪,痛觉,心血管活动等