在臉上塗抹蘆薈的好處和副作用

Medical uses of aloe vera

Aloe vera plants have long, thick, triangular leaves and are relatively easy to grow. The thickest outer layer is the peel; the middle layer is the bitter yellow juice; and the center is a gel that can be applied directly to the skin.

In traditional and folk medicine, aloe vera has been used internally and externally to treat a variety of unrelated ailments. Today, aloe vera supplements, juices, and skin and hair care products are considered to have therapeutic properties.

Here's what some current research says about the benefits of aloe vera for skin health.

Skin wounds and conditions

Aloe vera gel applied to the skin is thought to treat, prevent, or relieve many conditions, including:

  • sunburn
  • burns
  • surgical wound
  • skin ulcers
  • rash
  • Oral ulcers
  • cold sores
  • genital herpes
  • psoriasis
  • eczema
  • bedsores

In existing research, there is evidence that aloe vera gel is well suited for use as a wound dressing. It can promote the healing of burn wounds better than Vaseline gauze or 1% silver sulfadiazine ointment.

There is insufficient evidence to support its effectiveness in supporting recovery from thermal burns and possibly UV radiation, but the research is outdated and has not been repeated.

Similar to the results with wound dressings, surgical wounds treated with aloe vera gel not only promote healing but also help relieve incision pain.

Some studies show that aloe vera can lighten dark spots (also called hyperpigmentation) on the skin after four to five weeks of treatment. However, more research is needed to determine the effectiveness, optimal formulation, and appropriate concentration of aloe vera.

Laboratory studies show that aloe vera does this by accelerating the growth of new skin cells, including protective keratinocytes, and strengthening fibroblasts. 9 Additionally, the gel appears to have potent antibacterial and anti-inflammatory properties.

Even so, research results are inconsistent, with some studies showing no improvement or even delays in wound healing.

A 2020 review of 40 studies concluded that there is insufficient evidence to recommend aloe vera as an effective treatment for psoriasis, acne, or eczema.

There is also no evidence that aloe vera can speed the healing of cold sores or genital herpes, both of which are caused by the herpes simplex virus (HSV).

Can Aloe Vera Anti-Aging?

In addition to increasing skin cell turnover, aloe vera gel contains antioxidants and UV protective compounds that may prevent long-term skin damage and photoaging.

Therefore, aloe vera may be beneficial to your skin care routine, with some studies showing that aloe vera can significantly reduce wrinkles and dryness on the face.

Other possible benefits

Aloe vera may provide other health benefits, such as:
  • Relieves heartburn, burping, and reflux in GERD
  • Improve constipation
  • Lower blood sugar in diabetics
  • Improve triglyceride and HDL cholesterol levels in patients with diabetes
  • Fight tooth decay

However, research results are often mixed and the evidence is limited.

In 2002, the U.S. Food and Drug Administration (FDA) banned laxative manufacturers from adding aloe vera to their over-the-counter products because of a lack of evidence to support its safety.

aloe vera side effects on face

Side effects of applying aloe vera to the skin (topically) are uncommon. Even in oral form, the plant is generally well tolerated. This is especially true for topical and oral aloe vera preparations that have had the latex removed.

Common side effects

Skin irritation is possible as a side effect when using aloe vera topically, but is uncommon. Aloe vera can also cause allergies and hives, especially in people allergic to other plants in the Liliaceae family, such as onions, garlic, and tulips.

If you develop itching, swelling, rash, or hives, you may be sensitive to the gel and should stop use immediately. Aloe vera gel should not be used on infected skin.

Common side effects of taking aloe vera by mouth include:

  • nausea
  • diarrhea
  • stomach cramps
  • Vomit

serious side effects

The risk of side effects may vary depending on the aloe vera formula. Aloe vera gel and juice appear to cause fewer reactions than whole-leaf aloe vera extract and aloe vera latex found in some oral supplements. Overall, overusing aloe vera can cause problems.

When taken in higher doses, aloe vera may cause:

  • Drug-Induced Hepatitis : Risks vary, but liver toxicity usually occurs with long-term use of aloe vera oral supplements over a period of months or years.
  • Acute Renal Failure : Long-term use of aloe vera latex at doses exceeding 1 gram per day may cause kidney damage. Some cases of kidney failure caused by aloe vera are fatal.

Aloe vera and cancer risk

Aloe vera whole leaf extract has shown clear evidence of carcinogenic activity in rats and has been classified as a possible human carcinogen (Group 2B) by the International Agency for Research on Cancer. So far, human studies show a trend toward increased risk of colorectal cancer, but more research is needed.

How to apply aloe vera to your face

  1. Use clean hands to snip off a leaf near the base of the plant.
  2. Place cut side down in a glass and let the latex drain for about 10 minutes, then discard.
  3. Remove the leaf spines and use a vegetable peeler to remove the clear gel inside.
  4. Scoop out the gel and store it in a clean, sealable container in the refrigerator.
  5. Keep refrigerated for up to two weeks.
  6. Place a small amount of gel on your fingertips and gently work it into the skin in a circular motion.
  7. If using as a face wash, rinse with cold water and pat skin dry.
  8. If using as a facial moisturizer or for other skin conditions, lightly apply a thin layer of aloe vera gel to skin and allow to dry.

drug interactions

Taking aloe vera by mouth may interact with certain medications. In some cases, it increases the concentration of the drug in the blood (and the risk of side effects), and in other cases, it decreases the concentration of the drug in the blood (and the drug's effectiveness).

If you take any of the following medications, talk to your healthcare provider before taking aloe vera by mouth:

  • laxative
  • Diabetes medications, including insulin and Glucophage (metformin)
  • Diuretics ("water pills"), such as Lasix (furosemide)
  • Heart rhythm medications, such as Lanoxin (digoxin)
  • Anticoagulants ("blood thinners"), such as aspirin and coumadin (warfarin)

Precaution

Stimulant laxatives should be used with extreme caution during pregnancy and only for short-term relief of constipation. Similar precautions should be taken due to the stimulant laxative properties of aloe latex and whole-leaf aloe vera extract. Overuse of stimulant laxatives can cause uterine contractions, increasing the risk of miscarriage or premature birth.

Aloe vera (either in gel or latex form) may not be safe to take orally during pregnancy and while breastfeeding.

Recommended dosage

There are no recommended dosages for any form of aloe vera.

Aloe vera products for skin use can range in concentration from as low as 0.5% to over 99%. There is no evidence that lower concentrations are less effective than higher concentrations. As a rule of thumb, start with the lowest dose possible and gradually increase if necessary, never exceeding the manufacturer's recommended dose.

Oral preparations of aloe vera include capsules, extracts, powders and juices. To be on the safe side, follow the manufacturer's dosage instructions, especially for aloe vera latex and whole leaf extract supplements.

Preparation and selection

Pure aloe vera gel contains therapeutic amino acids, fiber, lipids, sterols and vitamins. The gel from the plant is safe to eat, but store-bought aloe vera gel should only be used topically because it's not known whether it's safe to eat.

Aloe vera products include topical gels, juices, and oral capsules. They are approved for use in cosmetics or dietary supplements but are not intended to treat any medical condition. They are also not tested for quality or safety.

Dietary supplements are not regulated in the United States, which means the FDA does not approve a product's safety and effectiveness before it is marketed. If possible, choose supplements that have been tested by a trusted third party.

However, even if supplements are third-party tested, that does not mean they are safe for everyone or effective overall. Therefore, it is important to discuss any supplements you plan to take with your healthcare provider and check for potential interactions with other supplements or medications you take.

Since few aloe vera supplements are certified by the United States Pharmacopeia (USP) or similar certification body, stick to well-known brands with established market positions.

It is important to read the ingredient list and nutrition facts list of a supplement carefully to understand which ingredients are included and the amount of each ingredient. Please review this supplement label with your healthcare provider to discuss potential interactions with foods, other supplements, and medications.

generalize

People have used aloe vera for medicinal purposes for centuries. Today, it remains an alternative medicine option, but research supporting its health benefits is limited.

Its most common use is when it is applied to the skin to aid in the healing of burns and wounds. Additionally, evidence supporting aloe vera's ability to improve other health conditions is limited, but more research is needed.

Finally, aloe vera latex (also found in unbleached whole leaf extract) has laxative properties. However, latex also produces more side effects than aloe vera gel. Consult your healthcare provider before using this product or starting a new nutritional supplement.

Review

All comments are moderated before being published

HealthyPIG Magazine

View all
用粟粉醃肉有乜科學根據?揭開中菜「滑肉」嘅秘密

用粟粉醃肉有乜科學根據?揭開中菜「滑肉」嘅秘密

前言:點解中餐炒肉咁滑? 好多香港人炒肉嘅時候都會發現,餐廳啲雞絲牛柳炒出嚟特別滑溜、唔鞋口。呢個秘密,唔喺高級食材,而係一個平凡但強大嘅材料——粟粉(Cornstarch)。 呢種技巧叫做**「走油前醃」或「滑油醃肉法」(Velveting)**,係中餐獨有技術之一,主要靠粟粉、蛋白、調味料...
咩係三價鐵(Fe³⁺)同二價鐵(Fe²⁺)?

咩係三價鐵(Fe³⁺)同二價鐵(Fe²⁺)?

當我哋講「鐵質」時,唔止係話有冇攝取足夠,而係講緊鐵喺人體內唔同形態(尤其係三價鐵 Fe³⁺ 同二價鐵 Fe²⁺)點樣被吸收、轉化、運輸同儲存,呢啲都深深影響生物可利用率

全面解構低鐵原因、病理機制及影響

全面解構低鐵原因、病理機制及影響

低鐵唔止係營養問題,仲可能係身體慢性警號

鐵質(iron)係人體不可或缺嘅微量元素,主要負責攜帶氧氣嘅血紅素(hemoglobin)製造、能量代謝、免疫調節等。當鐵質長期攝取不足、吸收差、或失去過多,就會導致「低鐵」(iron deficiency)甚至發展成「缺鐵性貧血」(iron deficiency anemia)。本文將從臨床醫學與分子生理角度,深入探討低鐵嘅成因、病理機制、生物轉化過程,以及其對人體造成嘅連鎖影響。

Obefazimod(ABX464):潰瘍性結腸炎新藥研究、作用機制與研發進展

Obefazimod(ABX464):潰瘍性結腸炎新藥研究、作用機制與研發進展

Obefazimod(又名 ABX464)係由法國生物科技公司 Abivax 開發嘅口服小分子創新藥,目標治療慢性發炎性腸道疾病(IBD),特別係潰瘍性結腸炎(UC)同克羅恩氏病(CD)患者。

夢遺係唔係一定關性事?

夢遺係唔係一定關性事?

夢遺,即係在無意識之下於睡眠中射精,係一種常見於青春期男生甚至成年男性身上的自然生理現象。夢遺唔等於一定發生性夢,也唔等於有性慾過強。它與睡眠週期中快速動眼期(REM sleep)嘅勃起模式有關,亦可能反映正常的荷爾蒙波動及精液排出節律。 咩係夢遺? 夢遺(nocturnal emission...
唔凍都會打冷震?

唔凍都會打冷震?

打冷震(shivering)唔一定因為天氣凍,喺情緒波動、發燒初期、焦慮、緊張等情況下都可以出現。打冷震係一種由大腦下視丘控制嘅「非意識性肌肉收縮」,目的係維持或調節核心體溫或應對突發壓力。了解打冷震背後嘅神經與體溫調節原理,可以幫我哋區分「正常生理反應」同「潛在疾病警號」。 打冷震係乜回事...
一緊張就流手汗?

一緊張就流手汗?

手掌汗腺主要受交感神經系統控制。當人面對壓力、驚訝、社交場合等刺激時,大腦會啟動「戰鬥或逃跑反應」,促使手掌、腳底等部位產生明顯出汗。這種情況屬於精神性出汗,與溫度無直接關係,係身體對外在壓力的自然反應。

起身「眼前一黑」係咩事?

起身「眼前一黑」係咩事?

當你由坐或瞓姿突然企起,血液未能即時供應足夠氧氣到腦部,形成姿勢性低血壓(orthostatic hypotension),導致短暫性視野模糊、頭暈甚至站立不穩。青少年、長者、飲水不足或患有自律神經功能障礙人士較常出現。

瞓覺點解會流口水?

瞓覺點解會流口水?

唾液分泌受副交感神經控制,當身體進入深層睡眠並肌肉放鬆時,容易出現流口水現象,尤其側睡或口微開者更明顯。