My very dear Nina,
It is very good if you can recite these mantras before doing the healing: 

• Stainless Light mantra (you can also recite this mantra while doing the healing, if appropriate)
• Mantra taught by Buddha Droden Gwayla cho
• Celestial Jewel Mansion—Great Increasing Jewel

You should recite these three mantras in the morning before you do the healings. By reciting these mantras in the morning, any person you then meet has their five uninterrupted negative karmas purified. By reciting them in the morning, it makes your whole day meaningful.

You should recite the Celestial Jewel Great Increasing mantra in the morning as part of your daily practice. Also, you can recite it to the patients.

When you are doing the healings, these are the mantras to recite out loud, so the person can hear them. You can make them into a song if you want to:

• Medicine Buddha mantra
• Chenrezig mantra
• Wish granting wheel mantra number five, in the Five Great Mantras booklet. Reciting this at least seven times or more is best.
• Stainless Pinnacle, number four in the booklet
• Maitreya Buddha mantra
• Mitukpa mantra
• Namgyalma mantra

If you can chant these in front of the person, singing a tune, it is incredibly beneficial for them. These mantras are very good for the people to hear, as the mantra purifies their negative karma, so there is much deep benefit. They can even heal the sicknesses, since through hearing the mantras it purifies their negative karma, even the five uninterrupted negative karmas. That is an unbelievable gift to those people; it is priceless and wish-fulfilling. They get to hear Dharma and that creates an imprint for their next life, to bring them to enlightenment. By chanting the mantras they receive unbelievable purification.

If they ask you what you are chanting, you can just say it is for healing and purification.

By reciting Medicine Buddha mantra, one isn’t reborn in the lower realms. This not only relates to human beings, but also to animals.

Maitreya Buddha mantra helps them to not be reborn in the lower realms, helps their mind to go to virtue, and also helps them to develop prosperity, to be reborn as one thousand wheel-turning Kings or as a deva. When Maitreya Buddha descends into this world, Maitreya Buddha will look for them, and anyone who hears this mantra will then become first disciples of Maitreya and receive a prediction of their enlightenment.

These mantras bless their body, speech, and mind, so there is no question that if you touch the patients, even if your shadow touches them (this is referring to the first three mantras), that their negative karma is purified and also helps them to not be reborn in the lower realms.

Then, if they hear the mantras (referring to the next seven mantras), it also purifies their negative karma and they aren’t reborn in the lower realms. You can see how important this is.

You don’t have to recite all the mantras, just any of these; you could do one, two, or three. The main thing is for them to hear you reciting the mantras, which creates unbelievable benefit, deep like the ocean.

With much love and prayers...