One of the best ways to make your friends happier is to be happier yourself. That is, you tend to be happier when you are around people who are happier. Similarly, your happiness will rub off on your friends. Relationships, no matter the form, are a key to happiness. Therefore, just spending time with your friend can make both of you happier. Make sure to encourage one another, as well as offer gratitude for the relationship, all of which will increase her happiness. For instance, you could let her know that you value her friendship by telling her regularly, such as saying "I just want you to know how glad I am you're in my life," or by sending her a card every now and then. "Laughter is the best medicine" is a saying for a reason. Laughing can make you happier and healthier as a person, so try to get your friends to laugh by cracking jokes or even poking (light) fun at yourself. Everyone needs to hear they are are smart, strong, and beautiful sometimes. Don't be afraid to tell your friend these things, as they can help her build confidence and self-esteem. Try to make your compliments unique to the person, so she knows you truly mean what you say. For instance, saying "I really like how you take the time to listen to everyone you meet. It shows how much you care about people." is a more specific compliment then, "You're a good listener." If your friend is grouching about a situation at work, for instance, help her see the positive side of things. That doesn't mean you should downplay her feelings. In fact, definitely hear out her problem before reacting. But try to help her asking probing questions such as, "What things can you do to make the situation better?" or "What's been happening at work lately that's been good?" Research shows that those who choose to look for happiness learn to be more optimistic overall, making them happier in general. True happiness is in part about the adventure. It may mean you may need to step outside of what's comfortable and try something new, and in turn, discover new things you love. If you want your friends to be happy, encourage them to try new things with you. For instance, try a new restaurant in your city, explore nearby towns, or begin a new hobby together.
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One-sentence summary -- Be happy yourself. Spend time together. Make her laugh. Build up her self-esteem. Help her to see the positive side. Try out new things together.

When shopping for skincare products, look for facial moisturizers that contain collagen peptides. Collagen is a part of your skin that helps it remain moisturized and elastic. Over time, the collagen in facial skin breaks down, contributing to both sagging and wrinkles. Using a collagen cream may help replenish your skin's natural collagen, making your skin appear tighter and more moisturized. Not all collagen creams contain the same added ingredients or percentage of collagen. When using a collagen cream, read the label carefully to see how often the cream should be applied. Vitamin C serums contain concentrated doses of vitamin C that can tighten skin, reduce sun and age spots, reduce redness, and boost the production of collagen. Unlike drinking vitamin C (which is also healthy!), serums allow your skin direct contact with the vitamin so that the benefits are absorbed right into your skin. Vitamin C serums are safe for most skin types, so this is a great option if you have any allergies or skin sensitivities. Serums often include other skin-tightening ingredients, including retinols, hyaluronic acid, and collagen peptides. Most vitamin C serums are safe to use 1 to 2 times per day. However, always check the label on your vitamin C serum to see how often it is safe to use. Hyaluronic acid is a naturally-produced molecule that binds water to the collagen in your facial skin. Like collagen, hyaluronic acid breaks down over time, leaving your skin vulnerable to dehydration and sagging. Applying a hyaluronic acid moisturizer daily can help re-hydrate your skin, making it appear tighter and healthier. Hyaluronic acid is generally considered a great option for all skin types and does not usually trigger allergic reactions, break outs, or rosacea. Thus, it can usually be added to your daily skincare routine. These products work through exfoliation, meaning they cause shedding of the surface skin. Be aware that using creams with glycolic or lactic acid can increase your skin's sensitivity to UV. If you start noticing that your skin is getting redder in the sun than before you started using this cream, stop using it and try a different treatment. Check the ingredients before you buy, because the concentration of acid should be 10 percent or less to be safe. Retinol is one of the most popular skin-tightening ingredients and can be found at almost any pharmacy, drug store, or skincare retailer. Retinol creams have been shown to help reduce wrinkles, tighten skin, and make skin damage less visible. While retinol can be the most effective skin-tightening ingredient for some, it comes with a long list of potential side effects, including dryness, irritation, sensitivity to sunlight, redness, swelling, and blistering. Because retinols can cause irritation, it is generally recommended that you use them only 2 to 4 times per week. If you experience any side effects, decrease your usage to 1 time per week. Contact your doctor if the side effects persist or are extreme. Retinol may also help reduce acne outbreaks.
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One-sentence summary --
Use a collagen cream to keep skin supple. Try a vitamin C serum to brighten and tighten your skin. Apply a hyaluronic acid serum or cream for hydrated, plump skin. Use a cream or serum with glycolic or lactic acid to tighten skin. Use retinol to reduce the wrinkles on your face.